"Jesus Christ. Bobby, don't look."
"Huh?"
Suddenly, she stood up, and took off all her clothes. I instantly looked away when her top came off, and her boobs came bouncing out.
After sitting down again, she said, "I mean it, Bobby, I better not catch you staring at my tits."
"Like I really wanna look at my sister's tits. Don't be revolting."
I tried to focus on the TV, but I could still see her out of the corner of my eye, so I shifted around in my seat, to get her out of my field of vision. That worked for a while, but then I found myself compelled to glance in her direction. I fought that urge for a while, until...
"Dammit!"
"What is it, Jess?"
"This heat's making me really horny. Like, y'ever been so horny, your legs start spazzing?"
"Jess, gross! I don't wanna know about that!"
"Well, look, could you just concentrate on the TV? I really need to play with myself right now."
"You can't do that in your room?"
"It's way too hot in there. Look, I just need to cum, then I'll be okay."
"Never mind! Just do whatcha' gotta, and leave me out of it!"
Though I wasn't looking, I could sense her opening her legs. And then the smell hit me, which I tried desperately to ignore.
"Y'all ain't gonna peek, are ya?"
"No, no, just do it."
"I mean it, don't be lookin' at my pussy!"
"I'm not going to look! Just do it, alright?"
I turned up the TV, so I wouldn't have to listen as Jess started to masturbate.
"Ouh, mmhm, shit..."
I tried looking away, but Jess' sighs and moans were too loud and distracting. I glanced at her, and saw her face was screwed up, like she was going to sneeze. I was starting to feel really weird. I fought the urge to look down, but found myself stealing glances. My sister's pussy was practically dripping, as she fingered her clit. I breathed in, and the smell flooded my nostrils. Suddenly, I felt my cock start to harden. This was fucking surreal, watching my sister play with her pussy, with a raging hard-on. Eventually, I realized I was gonna have to get off, too. I pulled down my shorts, and proceeded to stroke my cock, as I watched my sister play with herself.
"Oooh, hmmm..." It was probably inevitable Jess would be alerted by my grunting. She opened her eyes, and saw me masturbating, and looking at her. "Bobby, what the fuck?"
"I can't help it, Jess! Believe me, I really hate myself right now."
"You fucking perv!"
"I know, I'm sorry!" I suddenly saw Jess craning her neck up, like she was trying to see something.
"Well, look, Bobby, if you're gonna stare at me, could you at least turn your chair around?"
"What?"
"Turn to face me, so I can watch you, too."
This request confused me, but I nevertheless complied.
"Goddamn, Bobby.