The basement smelled of old carpet and the faint ozone from the computer monitor. I sat there every night after everyone else had gone to bed, scrolling through the alt.sex.stories archive, my hand already working inside my shorts. The threads were always the same—mind control, brothers and sisters, fathers and daughters—fantasies so filthy they made my pulse hammer. Then the new post appeared, buried in a long thread: a simple text file attachment with no name, just a string of commands that promised real control.
I downloaded it without thinking. The words on the screen seemed to crawl into my eyes and settle behind them. When my younger sister Emily walked down the stairs in her thin nightshirt two nights later, I felt the change click into place like a key turning.
She paused at the bottom step, blinking. “What are you doing down here so late?”
“Come here,” I said. The sentence left my mouth wrapped in something heavier than my usual voice. Emily’s steps slowed, then resumed, her bare feet silent on the concrete. She stopped in front of my chair, eyes slightly unfocused.
“Sit on my lap.”
She did. The heat of her through the cotton nightshirt was immediate. My hands moved on their own, sliding up her thighs until my thumbs brushed the edge of her panties. Emily shivered but didn’t pull away.
“Tell me you want this,” I whispered against her ear.
“I want this,” she answered, voice flat and obedient at first, then thickening with sudden, raw need. “God, I’ve wanted this for years.”
The program was working. Every command I typed into the old terminal upstairs translated into her body now. I told her to stand and strip. She peeled the nightshirt over her head, small breasts rising with each breath, nipples already tight. When I told her to turn around and bend over the desk, she obeyed without hesitation, presenting herself. I pressed two fingers between her legs and found her already slick, the mind control bypassing every layer of resistance and replacing it with desperate, dripping hunger.
I fucked her there on the old desk, one hand over her mouth to keep her quiet, the other gripping her hip hard enough to leave marks. Every thrust made her push back harder, whispering broken little pleas that the program had planted: “Use me. Make me yours. Don’t stop until you fill me.” When I came inside her, she came with me, thighs shaking, the sound of her muffled orgasm echoing off the concrete walls.
Afterward she stayed bent over, breathing hard, until I told her to stand and clean me with her mouth. She dropped to her knees without a word, licking and sucking until I was hard again. The power exchange was total; every filthy suggestion I gave her became her only truth.
Upstairs, our parents slept. Down here, the old computer fan whirred while I used my sister in every way the archive had ever described. I made her call me “Daddy” even though I was only two years older.
I made her beg for my cum on her tongue, then swallow and thank me. Each new command layered deeper, until her eyes glazed with permanent, willing submission whenever we were alone.
By the third night she was the one coming to me, crawling under the desk while I read new posts, taking me into her mouth before I even spoke. The program had rewritten her so completely that she initiated, voice low and urgent: “Tell me what to do. Make me do the worst things.”
I did. I made her ride me in our parents’ bed while they were at work, made her leave the door open, made her describe exactly how my cock felt stretching her while she came. The risk only sharpened the edge. Every time she called it “incest,” the word seemed to heighten her arousal, the forbidden weight of it feeding the control loop until she was shaking and begging for more.
Weeks later, the archive thread updated again with a single line: “Did it work?” I typed back one word—“Yes”—and felt Emily’s hand slide into mine under the dinner table, squeezing once, hard, her eyes dark with the knowledge that she would never want anything else again.
The story never ends in those archives. It just keeps going, one command at a time, until the line between fantasy and the body you’re holding disappears completely.
