Anal Training Session

Dr. Marcus Sterling had built his reputation—and his considerable fortune—on understanding the psychology of female pleasure. At forty-two, with silver threading through his dark hair and a physique maintained by daily CrossFit sessions, he ran the most exclusive sexual wellness clinic in Beverly Hills. His clientele included celebrities, politicians' wives, and women who simply wanted to understand their bodies better. But it was his pro-bono work with college students that he found most... stimulating.

"This has been way too easy," he thought to himself as he reviewed the intake form for his 10 AM appointment. Madison Hart, twenty-one years old, junior at UCLA, nursing major. Virgin until nineteen, currently in a relationship with a "well-endowed" boyfriend who wanted anal sex. Previous attempt at anal penetration had been "traumatic and painful." She was requesting his "Anal Preparation and Pleasure Protocol"—a twelve-session course he advertised discreetly on college health forums.

Marcus smiled, adjusting the impressive bulge in his custom-tailored trousers. Madison's photograph showed a petite brunette with wide hazel eyes, small pert breasts, and the kind of innocent expression that made his cock twitch with anticipation. Her form indicated she was 5'2", 110 pounds, with a "bubble butt" she was self-conscious about. Perfect.

When his receptionist announced Madison's arrival, Marcus took a moment to compose himself. He needed to project authority, medical professionalism, and just enough fatherly concern to make her feel safe while simultaneously awakening her deepest submissive instincts. It was a delicate balance, one he'd perfected over fifteen years of practice.

"Madison, welcome," he said, rising from his leather chair as she entered his office. He watched her eyes widen slightly—women always reacted to his height, his broad shoulders, the way his shirt strained against his muscular chest. "I'm Dr. Sterling. Please, have a seat."

Madison Hart was even more exquisite in person than her photograph suggested. She wore a sundress that hit mid-thigh, revealing toned legs that Marcus already imagined wrapped around his waist. Her chest rose and fell with nervous breaths, her small breasts pressing against the thin cotton fabric. When she crossed her legs, Marcus caught a glimpse of white lace panties.

"Thank you for seeing me, Doctor," she said, her voice soft and breathy. "I wasn't sure if I should... if this was appropriate..."

"Sexual health is health, Madison," Marcus replied, settling back into his chair and steepling his fingers. "There's no shame in seeking professional guidance. Now, tell me about your situation. Your form was quite detailed, but I'd like to hear it in your own words."

Madison's cheeks flushed a delicious pink. "It's my boyfriend, Ethan. We've been together eight months, and he's been so patient, but he really wants to try... you know... back there." She squirmed in her seat, and Marcus noted how she couldn't quite meet his eyes. "I tried once, in high school, with my first boyfriend. It was horrible. He just... shoved it in. I cried for an hour afterward. I thought I was broken."

"You're not broken, Madison," Marcus said, his voice dropping to a soothing rumble. "You're simply untrained. The anus is a muscle like any other—it requires preparation, relaxation, and proper technique. Most men have no idea how to initiate anal penetration properly. They see it in porn and think they can just slam their cock into a tight virgin asshole without consequence."

Madison gasped at his frank language, her eyes finally snapping up to meet his. "You... you said..."

"Cock? Asshole?" Marcus smiled, enjoying her discomfort. "Madison, we're adults discussing sexual mechanics. I find that using precise terminology helps eliminate shame and confusion. You want to learn how to take your boyfriend's penis—presumably quite thick, based on your notes—deep into your anal canal without pain. You want to experience the intense anal orgasms that are possible with proper stimulation. You want to be a woman who can offer her man the tightest, most forbidden hole in her body and enjoy every filthy, depraved second of it."

Madison's mouth opened slightly, her breathing becoming more rapid. Marcus could see her nipples hardening beneath her dress, twin peaks of arousal she probably didn't even recognize in her innocence.

"I... I don't know if I can..." she whispered.

"That's why you're here," Marcus said, leaning forward. "My Anal Training Protocol has a ninety-four percent success rate. Over twelve sessions, I will teach your body to accept penetration, to crave it, to orgasm from it. By the end, you'll be able to take your boyfriend balls-deep in your ass and beg him for more. But it requires commitment, Madison. It requires trust. And it requires that you follow my instructions exactly, no matter how... unconventional they may seem."

Madison bit her lower lip, a gesture that made Marcus's cock strain against his zipper. "How much does it cost? I saw the rates online..."

"For students, the program is complimentary," Marcus interrupted. "Consider it my contribution to sexual education. I only ask that you commit fully to the process. We begin today, if you're willing."

"Today?" Madison's eyes widened. "I thought... I thought there would be talking first, or..."

"The best way to learn is through direct experience," Marcus said, rising and moving to lock his office door. The click of the lock made Madison jump. "Stand up, Madison. Let me examine you. I need to assess your baseline physical condition and your psychological readiness."

Madison stood on shaky legs, her hands trembling at her sides. Marcus approached her slowly, circling like a predator. He could smell her perfume—something floral and young, mixed with the faint musk of nervous arousal.

"Remove your dress, please."

"Here? Now?" Madison's voice was barely audible.

"Madison, in this room, I am your sexual physician. Your body is my textbook. If you cannot follow a simple instruction to disrobe, how will you handle the more... demanding aspects of anal training?" Marcus kept his voice firm but kind. "I assure you, I have examined thousands of women. Your modesty is safe with me, even as I teach you to abandon it."

Madison's hands moved to the straps of her sundress. With shaking fingers, she lowered them, letting the fabric pool at her feet. She stood before him in white lace bra and matching panties, her skin pale and flawless, her small body trembling.

"All of it, Madison. I need to see everything."

She reached behind her to unclasp her bra, revealing small, perfect breasts with pink nipples already erect. Her panties followed, sliding down slim thighs to reveal a neatly trimmed dark bush and the hint of her slit between her legs. Marcus drank in the sight of her—her narrow waist, the flare of her hips, the firm roundness of her ass that he would soon be training to accept his cock.

"Turn around. Bend over and touch your toes."

"Doctor..."

"Now, Madison."

She obeyed, turning and bending, presenting him with the most intimate view of her body. Her asscheeks parted slightly with the position, revealing the tight pink rosebud of her anus and the glistening wetness of her pussy. Marcus felt his mouth water. She was perfect—tight, untouched, his to mold.

"Excellent," he said, moving closer. He ran a hand over the curve of her hip, feeling her flinch at his touch. "Your anatomy is ideal for anal training. Small frame, which means tight musculature, but also flexibility. Your anus appears healthy and properly positioned. But I need to assess your muscle tone internally."

Madison gasped as his fingers traced down her spine to the cleft of her ass. "Doctor, I don't know if..."

"Relax, Madison. This is a medical examination. I'm going to insert my finger into your anus to check your sphincter tone. I need you to bear down slightly, as if trying to have a bowel movement. This relaxes the external sphincter."

He applied lubricant from a nearby dispenser—he kept his office well-stocked for exactly these scenarios—and pressed his index finger against her virgin hole. Madison whimpered, her body tensing.

"Breathe, Madison. Push out."

She obeyed, and his finger slipped past the tight ring of muscle, engulfed in her hot, tight channel. Marcus groaned softly—she was exquisite, her ass clutching at his digit with virgin tightness that made him imagine how she would feel around his cock.

"Your sphincter is quite tight," he observed, working his finger in small circles, feeling her gradually relax. "This confirms what I suspected. Your previous experience failed because there was no preparation, no gradual dilation. The muscle went into spasm, causing pain. But with proper training, this same muscle will learn to open, to welcome penetration, to grip a thick cock in the most pleasurable way imaginable."

Madison was moaning now, soft sounds of confusion and arousal. Marcus's finger moved deeper, finding the thin wall of tissue separating her vagina from her rectum. He pressed gently, feeling her gasp as he stimulated her indirectly.

"Doctor... oh god... that feels..."

"Your prostate—your G-spot—is accessible through the rectal wall," Marcus explained, his voice steady despite his raging erection. "This is why anal sex can be so pleasurable for women. With a cock pressing against this spot, with the sensation of fullness, with proper clitoral stimulation... you can achieve orgasms far more intense than vaginal penetration alone."

He withdrew his finger slowly, watching her hole flutter closed, slightly more open than before. "Get dressed, Madison. Your first official training session begins now. We're going to my private training suite."

The "training suite" was Marcus's masterpiece—a soundproofed room adjacent to his office, furnished with equipment that served his particular methods. A massage table covered in Egyptian cotton sheets. A cabinet filled with toys of every size, shape, and function. Mirrors on the ceiling and walls so his students could watch their own transformation. And, most importantly, a camera system that recorded every session for "review purposes."

Madison stood in the center of the room, naked again, her arms crossed over her small breasts in a futile attempt at modesty. Marcus had removed his jacket and tie, rolling up his sleeves to reveal muscular forearms. He stood before her in dress shirt and trousers, his erection clearly visible against his thigh.

"The first rule of anal training," he said, circling her, "is arousal. The anus will not open for penetration unless the body is thoroughly aroused. Fear, anxiety, insufficient stimulation—these cause the sphincter to clamp shut. But pleasure, orgasm, submission—these open you, Madison. These make you ready to be fucked."

He moved behind her, his hands settling on her shoulders. "I'm going to bring you to orgasm, Madison. Not once, but multiple times. I'm going to teach your body what it's capable of. And only when you're completely relaxed, completely open, will we begin the actual penetration training."

His hands slid down her arms, then around to cup her small breasts. Madison gasped, her head falling back against his shoulder. "Your nipples are sensitive," he observed, rolling the hard peaks between his fingers. "Many women can orgasm from nipple stimulation alone. We're going to find out if you're one of them."

He pinched harder, pulling her nipples outward, and Madison cried out—a sound of pain mixed with shocking pleasure. "Yes," she whimpered. "Oh god, yes..."

Marcus kept one hand on her breasts while the other slid down her belly to her pussy. He found her clit—swollen, erect, peeking from its hood—and began circling it with practiced precision. Madison's hips bucked, her ass pressing back against his trapped erection.

"Please," she begged. "Please, don't stop..."

"Not until you've had at least two orgasms," Marcus growled in her ear. "I want you limp, Madison. I want you so relaxed that your asshole is practically begging for penetration. Touch yourself. Show me how you masturbate."

Madison's hand flew to her pussy, her fingers joining his in circling her clit. Marcus watched in the mirror as she touched herself, her face flushed, her body writhing. He increased the pressure on her nipples, twisting and pulling, feeling her orgasm building.

"Come for me, Madison. Let go."

She shattered, her cry echoing in the room, her body convulsing as wave after wave of pleasure crashed through her. Marcus held her up, his fingers never stopping their assault on her sensitive flesh, forcing her through the peak and into overstimulation.

"Too much," she gasped. "It's too sensitive..."

"One more," Marcus commanded. "Push through it. Your body can give you more than you know."

He spun her around and lifted her onto the massage table, spreading her legs wide. Before she could recover, he buried his face between her thighs, his tongue lapping at her swollen pussy, circling her clit, then plunging deep into her entrance. Madison screamed, her hands clutching at his hair, her hips grinding against his mouth.

Marcus ate her with abandon, his tongue flicking her clit, then sliding down to tease the entrance of her ass. He felt her freeze, then moan louder as he circled her anus with his tongue, preparing her for what was to come. No woman could resist this—the forbidden pleasure of having her most private hole worshipped.

"Oh god, oh god, oh god," Madison chanted, her second orgasm building fast. When Marcus sucked her clit into his mouth and pressed two fingers against her asshole, she exploded, her body arching off the table, her juices flooding his chin.

Marcus stood, wiping his face with a towel, watching Madison twitch and moan on the table. She was ready now—limp, glowing, her inhibitions shattered by pleasure.

"Now," he said, moving to the cabinet, "we begin the actual training."

He returned with a set of anal plugs, graduating in size from slender to substantial. "These will train your sphincter to open and stay open. We'll start with the smallest, but first—more lubrication."

He squeezed a generous amount of warming gel onto his fingers and pressed them against her asshole. Madison whimpered but didn't resist as he worked one finger, then two, into her tight channel. She was looser now, her muscles relaxed from orgasm, and he scissored his fingers gently, stretching her.

"The key," he explained, watching his fingers disappear into her body, "is gradual dilation. Your sphincter is a ring of muscle. Like any muscle, it can be trained. Tonight, you'll take the smallest plug. In our next session, larger. By session six, you'll be ready for a cock-sized trainer. And by session twelve..."

He pushed the small plug against her entrance, feeling her muscle resist, then give way. The plug slid in, its flared base settling against her cheeks. Madison gasped, her eyes wide.

"How does it feel?"

"Full," she whispered. "Strange. But not... not bad."

"Good. You'll wear this for the next hour while I teach you other techniques. Then you'll wear it home, removing it only to use the bathroom. Tomorrow, you'll insert it yourself and wear it for two hours. Each day, longer. Your body will learn to accept this presence, to crave it. And when we move to larger sizes, you'll be ready."

Marcus helped her sit up, the plug shifting inside her, making her gasp. "Now, Madison, it's time you learned to pleasure a man. Your boyfriend will expect reciprocity. Kneel before me."

Madison slid off the table, her movements careful, conscious of the foreign object in her ass. She knelt on the plush carpet, looking up at him with wide, uncertain eyes.

"Unzip me. Take out my cock."

Her hands trembled as she obeyed, lowering his zipper and reaching into his briefs. When she pulled out his erection—nine inches of thick, veined masculinity, the crown swollen and leaking pre-cum—she gasped.

"It's... it's so big," she breathed. "Ethan isn't... I mean, he's big, but..."

"Your boyfriend is probably average," Marcus said, stroking her hair. "I'm above average. Which means if you can learn to handle me, you'll have no trouble with him. Now, lick the tip. Taste me."

Madison hesitated, then extended her tongue, collecting the pearl of fluid from his slit. She made a surprised sound—whether at the taste or texture, Marcus couldn't tell—but she didn't pull away.

"Good girl. Now take the head into your mouth. Just the head. Use your tongue."

She obeyed, her lips stretching around his girth, her tongue swirling uncertainly. Marcus groaned, his hand tightening in her hair. "Use your hand on the shaft. Yes, like that. Stroke me while you suck. Deeper now. Take more."

He guided her head, teaching her rhythm, showing her how to relax her throat. Madison was an eager student, her initial hesitation giving way to enthusiastic participation. She moaned around his cock, the vibrations sending shivers up his spine, and Marcus realized she was grinding her hips against the floor, the plug in her ass making her desperate for friction.

"Touch yourself," he commanded. "Finger your pussy while you suck me."

Madison's hand flew between her legs, her fingers finding her clit. The sight of her—naked, plugged, masturbating while she struggled to take his thick cock down her throat—was almost too much. Marcus felt his orgasm building, the familiar tension in his balls.

"I'm going to come, Madison. You can pull away, or you can swallow. Your choice."

She didn't pull away. Instead, she sucked harder, her hand pumping his shaft, her eyes looking up at him with something like devotion. When he erupted, flooding her mouth with thick ropes of cum, Madison swallowed convulsively, her throat working, her body shaking with her own approaching orgasm.

Marcus pulled out, watching his cum dribble from her lips, and knelt to kiss her deeply, tasting himself on her tongue. "Beautiful," he murmured. "You're a natural. Now come for me one more time. Show me what a well-fucked little slut you are."

The word should have shocked her, but Madison was beyond shock. She rubbed her clit furiously, the plug in her ass shifting with her movements, and within seconds she was coming again, her body convulsing, her cries muffled against his shoulder.

Over the next four sessions, Marcus systematically trained Madison's body to accept penetration. She progressed from the small plug to a medium, then a large, wearing them for hours at home, learning to walk and sit with her ass filled. She learned to orgasm with the plugs inside her, the pressure against her rectal wall intensifying her climaxes.

She learned to finger her own ass, first one digit, then two, preparing herself for the day when a cock would replace her fingers. She learned the importance of enemas before anal play, of dietary considerations, of positions that opened her fully—doggy style, legs pulled back, ass elevated on pillows.

And she learned to deep throat, to take Marcus's entire length down her throat without gagging, her eyes watering, mascara running down her cheeks as she serviced him with increasing skill.

By session six, Madison was transformed. She arrived at his office wearing a butt plug—inserted herself, without prompting—and stripped naked with confidence, presenting her body for his inspection.

"Look at you," Marcus said, circling her, admiring the way her asshole now clung to the substantial plug she wore. "You've become quite the anal enthusiast, haven't you?"

"I think about it all the time now," Madison admitted, her cheeks flushing. "When I'm in class, sitting on this... I get so wet. I can't wait to feel... the real thing."

"Patience," Marcus chided, though he was pleased. "Tonight, we begin cock training. But not mine—not yet. Tonight you take the trainer."

He showed her the device—a realistic dildo, eight inches long and thick, with a suction cup base. "This will prepare you for your boyfriend. You'll learn to take it deep, to ride it, to take it hard. By the time you're ready for Ethan, you'll be a pro."

He positioned her on all fours on the training table, her ass facing him, the plug still nestled between her cheeks. Slowly, he withdrew it, watching her hole gape slightly, trained now to stay open. He applied lube—copious amounts, warming gel that would enhance every sensation—and positioned the dildo at her entrance.

"Push back," he instructed. "Take it inside you. Show me how hungry your ass is."

Madison pushed, and the thick head breached her sphincter. She gasped, her knuckles white where she gripped the table, but she didn't stop. Inch by inch, she impaled herself on the silicone cock, her body accepting the invasion, her trained muscles opening to receive it.

"Good girl. So fucking good. Take it all. Take every inch."

When the dildo was fully seated, its base pressed against her pussy lips, Madison was panting, her face flushed, her body trembling. "It's so deep," she moaned. "So fucking deep..."

"Now fuck it," Marcus commanded. "Move back and forth. Fuck your ass on that cock. Make yourself come."

Madison began to move, tentatively at first, then with increasing confidence. She rocked back and forth, the dildo sliding in and out of her ass, her moans filling the room. Marcus watched, stroking himself, mesmerized by the sight of her tight hole stretched around the thick shaft, of her small body taking such a substantial penetration.

"Touch your clit," he ordered. "Make it dirty. Make it nasty."

She obeyed, her fingers finding her swollen nub, and the combination sent her over the edge. She came hard, her ass clamping down on the dildo, her body shaking, her screams echoing off the mirrors. Marcus couldn't wait any longer. He positioned himself before her face, his cock hard and demanding.

"Suck me while you fuck your ass. Show me what a dirty anal whore you've become."

Madison took him into her mouth eagerly, her lips stretched around his girth, her tongue working his shaft as she continued to ride the dildo. The dual penetration—the silicone in her ass, Marcus's flesh in her mouth—seemed to drive her to new heights of depravity. She moaned around his cock, the vibrations making him groan, her eyes watering as she took him deep.

"I'm going to fuck your ass tonight, Madison," Marcus announced, withdrawing from her mouth. "Not the dildo. Me. My cock. Deep in your tight little asshole. Are you ready?"

"Yes," she gasped, her hips still working. "Please, Doctor. Please fuck my ass. I need it. I need to feel you inside me..."

Marcus moved behind her, withdrawing the dildo with a wet sound. Her hole gaped, open and ready, glistening with lube. He applied more—he would use plenty, always—to his cock, stroking himself as he positioned himself at her entrance.

"Push back," he commanded. "Take my cock. Take it like the good little anal slut you've become."

Madison pushed, and Marcus pressed forward. His crown breached her ring, and he groaned at the sensation—hot, tight, impossibly snug. She was ready, her body trained, but she was still tight, still virginal in the ways that mattered. He paused, letting her adjust, feeling her sphincter flutter around his shaft.

"Breathe," he reminded her. "Relax. Let me in."

She obeyed, and he slid deeper, inch by glorious inch, until he was fully seated, his balls pressed against her pussy, his cock buried to the hilt in her ass. Madison was making sounds—whimpers, moans, half-formed words of pleasure and disbelief.

"So deep," she chanted. "So fucking deep. Oh god, Doctor, you're splitting me open..."

"Good," Marcus growled, beginning to move. "That's exactly how it should feel. Now touch yourself. Come on my cock. Show me how much you love having your ass fucked."

He established a rhythm—slow, deep thrusts that filled her completely, then withdrew almost to the tip before plunging back in. Madison's fingers worked her clit frantically, her body tensing, her breath coming in ragged gasps.

"Harder," she begged. "Fuck me harder. Please, I need it..."

Marcus obliged, increasing his pace, his hips slapping against her ass, his cock pistoning in and out of her stretched hole. The sight of her—his cock disappearing into her body, her fingers blurring on her clit, her face twisted in ecstasy—drove him wild. He gripped her hips, pulling her back onto him, forcing himself deeper.

"You're taking it so well," he grunted. "Such a tight little ass. So fucking perfect. I'm going to fill you up, Madison. I'm going to pump my cum deep in your ass."

"Yes," she screamed. "Yes, fill me. Please, I'm coming, I'm coming..."

Her orgasm hit like a tsunami, her body convulsing, her ass clamping down on his cock in rhythmic spasms that milked him relentlessly. Marcus couldn't hold back. With a roar, he buried himself to the hilt and erupted, his cum flooding her rectum in thick, hot pulses, marking her, claiming her, completing her training in the most primal way possible.

They collapsed together, his cock still buried in her ass, both of them panting, sweating, trembling. Marcus slowly withdrew, watching his cum leak from her gaping hole, watching her twitch and moan as aftershocks rippled through her body.

"Perfect," he whispered, stroking her back. "Absolutely perfect."

Sessions seven through ten focused on advanced techniques—the kinds of things that would keep a boyfriend very, very satisfied. Marcus taught Madison how to do anal in different positions—cowgirl, where she controlled the depth and angle; spooning, for gentle, intimate penetration; standing, bent over furniture, for quick, dirty encounters.

He taught her about double penetration—fingers in her pussy while her ass was filled, the incredible fullness that drove women to the most intense orgasms of their lives. He introduced her to anal beads, to prostate massage (though she lacked a prostate, the equivalent stimulation drove her wild), to the psychology of submission that made anal sex so powerful for many women.

"You see," he explained during session eight, his cock buried in her ass while she lay on her back, legs pulled up to her chest, "anal sex is as much mental as physical. The taboo, the forbidden nature of it, the submission of offering your most private hole for penetration—these amplify the physical sensations. When you give your ass to a man, you're giving him everything. There's nothing more intimate."

Madison nodded, her eyes glazed with pleasure, her fingers rubbing her clit in tight circles. "I understand," she gasped. "I feel so... owned. So completely his..."

"Exactly. Now, I'm going to teach you the final technique—the one that will make your boyfriend addicted to you. We're going to train your ass to take a pounding. Hard, fast, deep thrusting that will make you both come like animals."

He flipped her onto her hands and knees, positioned himself behind her, and—without the gentleness of their first time—drove into her ass in one powerful stroke. Madison screamed, her back arching, but she pushed back, meeting his thrusts, her body now fully adapted to hard anal sex.

Marcus gripped her hair, pulling her head back, using it as leverage to fuck her harder. His hips slapped against her ass, the sound of flesh on flesh filling the room, his balls swinging forward to slap against her pussy with each thrust. Madison was incoherent, her face pressed against the mattress, her hands clawing at the sheets, her body shaking with the force of his pounding.

"Touch yourself," he commanded. "Come on my cock. Come while I fuck your tight little asshole."

She came instantly, her scream muffled by the mattress, her ass clamping down on him so hard he had to force his way through her spasms. The sensation was incredible—her body trying to expel him even as he forced himself deeper, the resistance making every nerve ending scream with pleasure.

Marcus followed her over the edge, his orgasm ripping through him, his cum flooding her already-full ass, leaking out around his shaft, dripping down her thighs. He kept fucking her through his climax, milking every drop, not withdrawing until he was completely spent.

Afterward, they lay tangled together, Madison's head on his chest, his hand idly playing with her breast.

"Two more sessions," he said. "Then you'll be ready for Ethan. Are you excited?"

Madison was quiet for a moment. "I... I don't know if I want to stop," she admitted softly. "These sessions... they've become everything to me. The way you make me feel... Ethan could never..."

Marcus kissed her forehead. "That's the danger of good training, Madison. You confuse the teacher with the lesson. What we've done here has prepared you for a lifetime of pleasure—with Ethan, with future lovers, with yourself. You don't need me to be happy. You need what I've taught you."

But even as he said it, Marcus knew he would miss her. She had been an exceptional student—eager, responsive, willing to push past her inhibitions into true sexual freedom.

Session twelve was the final exam—a complete demonstration of everything Madison had learned. Marcus invited her to arrive prepared: enema, plugs worn throughout the day, lingerie beneath her clothes. When she entered the training suite, she wore a silk robe that she let fall to the floor, revealing a black lace teddy that left her ass exposed, framed perfectly by the fabric.

"Stunning," Marcus breathed. "Truly stunning."

"Thank you, Doctor," she said, her voice confident now, the hesitation of their first meeting long gone. "I'm ready for my final examination."

"Then assume the position. Show me what you've learned."

Madison moved to the center of the room, where a large ottoman awaited. She bent over it, presenting her ass, reaching back to spread her cheeks and reveal her ready hole. "I'm prepared for penetration," she announced. "My ass is yours."

Marcus approached, already hard, already leaking pre-cum. He had planned to make this session about endurance, about multiple positions and prolonged fucking, but the sight of her—so open, so willing, so transformed—made him desperate.

He entered her in one smooth thrust, burying himself to the hilt, and Madison moaned, pushing back against him. "Yes," she hissed. "Fuck me, Doctor. Fuck my ass like you mean it."

He did. He fucked her with everything he had—hard, deep strokes that shook her body, that made her breasts bounce, that drove the air from her lungs in sharp gasps. He reached around to finger her clit, feeling her orgasm build, timing his own release to coincide with hers.

"Come with me," he commanded. "Now. Come on my cock while I fill your ass."

They came together, their voices rising in a duet of pleasure, their bodies locked together in the most intimate embrace. Marcus pumped rope after rope of cum into her bowels, marking her one final time, completing her training in the most definitive way possible.

Afterward, they showered together—another first—and Marcus helped her dress, feeling oddly melancholic.

"You'll do fine with Ethan," he said, adjusting her collar. "Remember everything I've taught you. Communication, preparation, arousal. And most importantly—enjoy yourself. Anal sex should be pleasurable for both partners. If it's not, you're doing it wrong."

Madison kissed him—soft, sweet, grateful. "Thank you, Doctor. For everything."

She left, and Marcus stood in his office, already planning his next pro-bono case, already anticipating the next innocent young woman who would walk through his door seeking the kind of training only he could provide.

As he sat down to write his notes, his phone buzzed with a text from an unknown number: "Doctor, this is Madison. Ethan and I tried it last night. He says it's the best he's ever had, and I came three times. Thank you for making me the perfect anal slut. If you ever want to check my progress... I'm available."

Marcus smiled, adjusting his already-stiffening cock. Perhaps he would check her progress. After all, advanced students needed advanced training.

And some lessons, he had learned, were worth repeating.