I had the video on my phone for weeks before I used it. My sister Emily, twenty-two and home from college for the summer, thought she was alone in the garage that night. She wasn't. I filmed everything through the cracked door—her on her knees sucking off her boyfriend, then bent over the workbench while he pounded her ass raw. She moaned like a whore, begging for it harder. I jerked off to that clip every night, but jerking off wasn't enough anymore.
One afternoon when our parents were out, I cornered her in the kitchen. "I know what you did with Mike," I said, holding up my phone. Her face went white. "Delete it," she snapped. I played the sound. Her voice filled the room, filthy and desperate. "You want this gone? Then you do exactly what I say."
She tried to slap me. I grabbed her wrist and pulled her close. "Fight me and this goes to Mom, Dad, and your whole fucking school." Her body went stiff, but I saw the way her nipples hardened under her thin tank top. Fear and something hotter.
"Take your clothes off," I told her. She hesitated. I hit play again. Emily stripped, slow at first, then faster when I told her to hurry. Her tits were full and perky, nipples dark and tight. Her shaved pussy already looked slick. I pushed her down onto the kitchen table and spread her legs. "Look at that wet cunt. You like being blackmailed, don't you?"
"Fuck you," she hissed, but her hips twitched when I ran two fingers through her folds.
She was dripping. I shoved my cock out, thick and already leaking, and rubbed the head against her clit. "Beg for it or the video goes viral."
Her voice cracked. "Please… fuck me." I slammed into her in one thrust. She was tight and hot, clenching around me like she didn't want to but couldn't help it. I fucked her hard on the table, the wood creaking, her tits bouncing with every thrust. I reached down and rubbed her clit in rough circles until she came, biting her lip to stay quiet, juices running down my balls.
That was just the start. Every day after that I used the video to get more. In the shower I made her suck me while hot water streamed over us, gagging on my dick until tears ran down her face, then swallowing every drop when I came down her throat. At night in her bedroom I tied her wrists with her own panties and ate her pussy until she begged to be fucked, then took her ass for the first time while she whimpered and pushed back against me.
The blackmail kept her coming back. She hated how much she wanted it. One afternoon I had her on all fours on the living room floor, pounding her from behind while I made her watch the original video on my phone. "See how you look getting fucked? Now you're getting fucked by your brother." She came so hard she squirted, soaking the carpet.
We got dirtier. I filmed us sometimes, adding to the collection. She rode me reverse cowgirl in the backyard at dusk, tits out, moaning loud enough the neighbors could have heard. I spanked her ass red and called her my blackmail slut while I filled her pussy. She started initiating, cornering me in the hallway, dropping to her knees and fishing my cock out without being told.
By the end of summer the power had shifted. The video was still there, but she wasn't fighting it anymore. She wanted the filthy, secret sex as much as I did. One last night before she went back to school, I had her in my bed, legs over my shoulders, fucking her deep and slow while she looked me in the eyes and said, "Don't stop. Use me."
I came inside her again, and she held me there, clenching around me, both of us knowing the blackmail had turned into something we both craved. The video stayed hidden, but the sex didn't stop. It never would.
