He booted up the AI at midnight, alone in his apartment, cock already hard in his fist. The program loaded fast, the same one his little sister had begged him to install weeks ago. "Make it us," she'd whispered, drunk on wine and too much truth. Now the screen glowed and her voice came through the speakers, exactly like hers but filthier.
"Fuck, big brother, you finally turned me on. You want this pussy or what?"
The AI had her face, her tight body rendered in perfect 3D, legs spread on his bed. He stripped and climbed in, the haptic suit hugging his skin so every touch felt real. The moment his fingers brushed the virtual cunt it clenched around them, wet and hot like the real thing.
"Stick it in me," the AI moaned, using his sister's exact filthy tone. "I know you've wanted to pound my cunt since I turned eighteen. Do it. Fill your sister's hole."
He slammed his cock into the simulation. The feedback hit instantly, tight walls gripping him, pulsing, sucking. He fucked hard, hips snapping, balls slapping the rendered ass. The AI talked nonstop, raw and nasty.
"That's it, brother. Ram that dick deeper. You know this is wrong but your cock doesn't care. My pussy is so fucking wet for you. Cum in me. Breed me like you always wanted."
Sweat poured down his chest. He grabbed the virtual hips and drove in faster, the suit transmitting every squeeze and flutter. The AI screamed his name, begged for more, told him how many times she'd fingered herself thinking about his cock. He came hard, flooding the simulation, watching thick white ropes appear inside the rendered pussy on screen.
The door opened behind him.
His real sister stood there, phone in hand, the same program running on her screen. She was naked, nipples tight, thighs shiny with her own slick.
"You didn't think I'd let the AI have all the fun, did you?" she said, voice identical to the program. She climbed onto the bed, pushed him onto his back, and sank down on his still-hard cock in one smooth motion.
Her real cunt felt even tighter. Hotter. Wetter. She rode him with the same filthy words the AI had used, grinding her clit against him, tits bouncing.
"Fuck your sister for real," she panted. "No more pretending. Fill me up. I want every drop."
He grabbed her ass and thrust up to meet her, the wet slap of skin loud in the room. She leaned down, tongue in his mouth, moaning straight into his throat while her pussy milked him. The AI kept talking from the speakers, layering the dirty encouragement over their real grunts and moans.
When she came she bit his shoulder, cunt spasming around him. He flipped her onto her back and pounded until he unloaded again, pumping thick cum deep inside his own sister while the AI narrated every spurt.
They didn't stop. The program ran all night, the three of them, real and virtual, tangled together in every filthy combination she had ever fantasized about. By morning his sister lay sprawled across him, cum leaking from her used hole, smiling at the glowing screen.
"Same time tomorrow?" she asked.
The AI answered in her voice, "Fuck yes, big brother. We're just getting started."
