I was still prepping my notes when the door burst open. Mary didn’t even wait for the invitation this time. She looked flushed, wild-eyed, and completely wired.

“Doctor W!” she exclaimed, nearly breathless. “You were right. You were so right!”

She didn’t even sit down first. She started pacing the small room, her hands moving animatedly as she spoke. She was wearing a pair of tight leggings and an oversized hoodie, looking every bit the college student in finals week, except for the frantic sexual energy radiating off her. The smell of her hit me even from behind the desk—it wasn’t just perfume, it was the sharp, musky scent of an aroused body.

“Calm down, Mary,” I said, keeping my voice steady but feeling that familiar thrill of anticipation. “Tell me what happened. You seem... enthusiastic.”

“Enthusiastic? Doc, I’ve been going crazy!” she laughed, a sound that bordered on manic. “The anal stuff? The homework? Oh my god. I started small, like you said. Just a finger in the shower while I was jilling off. But then one finger wasn’t enough, so I used two. Then three! And it felt amazing! It was like... like I’ve been ignoring this whole other part of my body!”

I leaned back, watching her. “Three fingers is impressive progress for a week, Mary.”

“That’s just the start!” she continued, stopping in front of the desk. “I couldn’t stop thinking about being stuffed back there. I started looking around my dorm room, just... needing something to plug me up. I used the handle of my hairbrush first. Then a toothbrush holder. It’s like... putting everyday objects inside my shitter gives me this thrill. Like I’m just a walking hole.”

“That is the start,” she gasped, gripping the edge of my desk. “I needed to be stuffed. My ass hole ached. I tore apart my dorm room. I found a hairbrush. The handle was thick plastic. I spit on it. I squatted on the floor and shoved it against my pucker. My tight muscle gripped the tip. I forced it inside. It popped through my sphincter. I buried it to the bristles. I kept it inside. I clenched around it. Then I used a toothbrush holder. Hard ceramic. I rammed it up my shitter. It stretched me wide. I love the stretch. I love turning myself into a container. I am a walking hole.”

She stopped pacing and looked right at me, biting her lip. “Actually... I’m plugged right now.”

Before I could even ask, she turned around and walked to the couch. Without a single word of instruction from me, she reached for the hem of her hoodie and pulled it over her head. She wasn’t wearing anything underneath. Her breasts bounced free, nipples already hard and purple. Then she peeled down her leggings and panties in one smooth motion, kicking them into the corner.

I stared. It was fascinatingly gross. I hadn’t told her to strip the moment she arrived. But her mind, malleable and corrupted, had filled in the gaps. She associated this room, this couch, and me with her nakedness and her pleasure.

She sat on the edge of the couch, spreading her legs wide. Her shaved pussy was pink and dripping, but my eyes were drawn lower. Protruding from her anus was the thick, black, plastic end of a jumbo Sharpie marker. The skin around it was red and glistening with what looked like spit and maybe a little lubricant. It was twitching. I don’t know how I missed it under her leggings. It must have been deep inside her.

“I’ve been walking around with it all day,” she confessed, her voice dropping to a husky whisper. “Just feeling it sitting in my guts. Every time I sit down in class, every time I walk... it pushes a little deeper into me. It’s driving me insane.”

“That is... remarkably dedicated, Mary,” I said, my throat dry. “A Sharpie up your ass all day? Doesn’t it hurt?”

“Yeah,” she giggled, wiggling her hips so the marker bobbed slightly, making a wet sucking sound. “It hurts good. It feels so naughty to be stretched open like this in public.”

“Well, then,” I said, turning to my laptop. “Let’s see what else you’ve been up to. Lie back.”

She complied instantly, settling into the divot. The Sharpie stayed put, a testament to her tight little sphincter, though a bead of clear fluid escaped around the rim.

I initiated the sequence. Lights. Sound. Scent. Click.

“Mary,” I said, my voice dropping into the command register. “You are open. You are honest. You are uninhibited.”

“I am uninhibited,” she sighed, her eyes glazing over.

“Tell me about the second part of your homework. Did you explore pleasure with someone new? Someone unexpected?”

“Yes,” she murmured, a slow, dirty smile spreading across her face. “Amy.”

“Amy?” I asked. “Tell me about her.”

“She’s... she’s in my Chem lab,” Mary recounted, her hands drifting down to her breasts, pinching her own nipples hard. “She’s short. Kind of mousey brown hair. Glasses. A total nerd. Usually, I wouldn’t look twice at her. Hell, I didn’t even think of girls sexually at all, let alone her.”

“But you looked twice,” I prompted.

“I did. We were at a party on Friday. I was already horny because I had a highlighter up my ass,” she admitted casually. “And I saw her in the corner. And suddenly... I just wanted her. I remembered what you said about being surprised by pleasure.”

Mary’s hands moved lower, sliding over her flat stomach to her clitoris. She began to rub herself, her fingers slick with her own fluids.

“I dragged her to a bedroom,” Mary continued, her voice growing breathy. “She was so surprised. But when I kissed her... god, she tasted like stale coffee and saliva. We stripped right there on the pile of coats.”

I watched her hand working. She was masturbating furiously now, her hips bucking against the leather. The Sharpie was pressed against the couch and moved in and out of her anus as her hips moved up and down, making a distinct squelch with every thrust.

“What was she like naked, Mary?”

“She was... hairy,” Mary said, and the way she said it sounded animalistic. “She had this thick, unkempt bush of dark hair. And hair around her nipples. And her asshole... it was hairy too. Smelled like musk. Normally I’d think that was disgusting. But... god, seeing it, smelling her ... it made me so wet. It was so primal. I buried my face in her muff and just lapped at her juices for hours. I licked her hairy asshole and she screamed.”

“How long did you fuck her?”

“We fucked all night,” Mary moaned, her pace increasing, her fingers digging into her own flesh. “We ground our cunts together until we were raw. I fingered her until my hand was covered in her slime. It was phenomenal. Better than any guy. Better than Trevor.”

“And her body? Any other details?”

“Her nipples,” Mary gasped. “They were pierced. Silver barbells. I sucked on them and she went crazy.”

I hit the pause button on the narrative, though not the machine. I needed to plant a seed while she was this heightened.

“Mary, listen to me. Piercings are a gateway to greater sensation. Pierced nipples, pierced clits... they enhance sexual pleasure. Sometimes doubling it. You experienced that with Amy. You should look into that for yourself. It would make you feel even more.”

“Piercings,” she panted, nodding feverishly. “Enhance pleasure. Yes.”

“Now,” I commanded. “Focus entirely on your own body. Forget the room. Forget me. You are just sensation. You are just a hole for pleasure.”

This was my cover. With her eyes squeezed shut and her mind locked onto her own orgasm, I was invisible. I unzipped my pants and pulled myself out. I was throbbing, harder than I had been in years. The smell of the room—sex, sweat, and the faint chemical tang of the marker—was intoxicating.

Mary was spiraling now. She had one hand on her clit, rubbing in a blur, and she had reached back with the other to grasp the end of the Sharpie. She was fucking herself with the marker, pulling it almost all the way out and slamming it back into her slime-filled rectum while she fingered her button.

“Oh god, Amy... hairy... fuck...” she babbled, drool escaping the corner of her mouth, her head thrashing side to side. “Fill my asshole... oh fuck...”

I stroked myself, matching her frantic pace. The sight of this beautiful, brainwashed girl, naked on my couch with a marker ramming in and out of her ass, moaning about her hairy, smelly lover... it was too much.

“Cum, Mary!” I ordered. “Cum for me now! Ruin yourself!”

She shrieked, a raw, ugly sound, her body bowing upwards. She slammed the Sharpie deep into her ass and held it there, her entire frame shuddering with a massive, squirting orgasm that soaked the leather beneath her.

I groaned, muffled by my hand, and shot ropes of cum onto the carpet under the desk. My release was violent, shaking me to my core.

We lay there in silence for a minute, the only sound her ragged breathing, the wet sounds of her body settling, and the hum of the machine.

“I... I have to go soon,” she whispered, still coming down, her voice hoarse. “Christmas break. I’m leaving tomorrow. I won’t be back for six weeks.”

Six weeks. I needed to leave her with something strong. Something to keep her mine while she was away. Something truly degrading.

“That is a long time, Mary,” I said, zipping up and composing myself, ignoring the mess on the floor. “But you will not be idle. I have instructions for your break.”

“Instructions,” she breathed.

“Yes. First. While you are home, you must try something sexual you have never done before. Be creative. Push your boundaries. Surprise yourself. Be filthy.”

“Creative. Filthy,” she agreed.

“And second,” I leaned in closer to the microphone. “On Christmas morning, before you open any presents... you will go to the tree. You will find a large, round ornament. And you will shove it up your butt. You will keep it there all morning while you are with your family. You will feel it stretching you while you smile at your mother. It will be your secret present to yourself. To me.”

“Christmas ornament,” she murmured, a wicked, depraved smile touching her lips. “Up my butt. While with mom. Christmas morning.”

“Exactly. Now focus on the room again.”

I killed the machine. Mary blinked, her eyes fluttering open. She sat up, wincing visibly as the Sharpie shifted inside her bowels. She reached back and pulled it out with a loud, wet pop that echoed in the small room. The end was coated in whatever lubricant she had used. She didn’t even grimace. She wiped it on her discarded hoodie before tossing it into her bag.

“Wow,” she said, stretching like a satisfied cat, oblivious to the fluids drying on her thighs as she pulled her leggings up. “That was... intense. I feel amazing.”

“Have a wonderful break, Mary,” I said, smiling professionally. “I look forward to hearing all about it when you get back.”

“You too, Doctor W!” She pulled the rest of her clothes back on, not bothering with the panties—they were soaked anyway—and stuffed them in her pocket. “Merry Christmas!”

She bounced out the door, leaving the scent of her corruption heavy in the air, and I sat back, imagining her at the family dinner table, a bauble tucked tight in her ass, leaking silently onto her chair.