Daniel and his sister, Jessica

Daniel had a laugh as he fiddled with the "omni app" or whatever it was called. He gave himself a special curse, which would make any girl who looked at his dick into a horny slut with no inhibitions. Every time they saw it they would want to taste it and get fucked by it, and if they got any ejaculate in them they'd become sluttier without anyone noticing the change.

It sounded like a laugh for a eighteen year old like yourself, and as you were about to take a picture to print out and leave it at school to see if it worked...

...Your one year older sister walks in on you with your phone in your left hand and your dick in your right.

"...God fucking dammit Dan," She swears as she closes her eyes and lets you have a second to push your dick back into your pants. "I was just looking for the wifi-password sheet and now I get this burned into my eyes," she whined as she closed the door behind her. ". Lock the door when you're jerking off. Or... at least send me a text," she said in a softer, more playful tone. You pause and look up as she plops down on the bed on your right. Her outfit had changed to a white top and denim shorts, and she wasn't wearing a bra. Her nipples poked through her shirt as she planted her hands on your hips. She mirthfully smelled the air above your crotch.

"You know I'll help you out if you're feeling pent up," she smirked as she began unbuckling your trousers. "It's like, a good learning experience for the both of us, you know. I get to learn how to jerk guys off, you get jerked off. Everyone wins!" she said as she pulled out your dick and began working your meat.

You couldn't believe what was going on. The program worked? This wasn't your plan, but your sister...

She was a goddess at handjobs!

"Ooh, I see someone's realizing they have a sister with a secret talent. Sorry to have kept you in the dark... but, you know, mom and dad wouldn't have approved if they found out." She said as she continued keeping you on edge, now and then blowing hot air on your dickhead. "But you know what? Fuck them. In fact," she said as she began working your dick fast and hard, quickly bringing you to a climax. "I'll have a little taste to remember this first time with," she said as she strangled your dick as you began to convulse, keeping your cum painfully clogged up for a second.

"Dinner time," she added as she went down, opened her mouth wide, wrapped her lips around the tip of your dick and released her grip. You could feel her tongue sliding down the bottom of your dick and your sperm shooting up into her throat. She swallowed eagerly.

This was bad, you thought to yourself with your eyes closed as you felt Jessica suck your dick clean after you've emptied the biggest load of your life into her mouth. What would your parents do if they figured out what had happened?

Well, Jessica was a total slut already, they'd probably roll their eyes at it, right? Wait, had she always been that way? you opened your eyes and looked at her again as she pulled herself off your dick.

"What was it I came here for again? Oh, the wifi password. I'll let you stuff a finger up my pussy if you send it to me," she said as she lifted up her skirt, showing she had no underwear on, which wasn't a big surprise. She was dressed as if she was about to leave, a sweater for the cold weather, a lose schoolgirl skirt that the wind would easily grab hold of, and a grey top with no bra beneath. "The captain of the basketball team wanted me to come by today, but I wanted to get some new music synced before I walked over there," she says as she hands you her phone, the lock screen an aheago face of herself... with a mess on her face.

"Um, sure...," you say as you type in 6969 for a guess at her pin code and unlock her phone. you insert the wifi-password and hands it back. She smiles, sits down on the bed and spreads her legs for you to get a good look at her shaved pussy.

"Well, go on, I'll let you warm it while I download some music," she said as she worked the phone with one hand and revealed one of her tits with the other. For some reason, this felt weird, but in a suspiciously normal way. You made your dick turn women into sluts, but your sister has always been sort of slutty, right? It's been a miracle she hadn't jumped your bone before tonight, right? You pondered this as you carefully stuffed an index finger inside of her, causing her to giggle and squirm around it for a moment before getting acquainted with its presence.