They're too horny (non-traumatic )

Mike looked to Greg, then Greg looked to his naked sister.

"Sorry Shelbs," he said, "But come on now, you can't hang out with us naked, show us your bald twat, then let us be in your asshole and expect us not to get horny."

Mike, always a follower, smiled at the realization that he was going to get laid. Shelby sighed and tried to make for the door, but her brother grabbed her. He was almost a foot taller than her and heavier than her, and Mike was bigger than them both combined almost, being a doughy but strong sort of loser.

Shelby had never been **** before, not truly, with the guy(s) cumming in her pussy, and really holding her down and being rough.

"Fucking hell, Greg! Let me go!" she protested. It was no good, nor were her attempts at resisting. Greg pushed her back onto the futon and got on top of her. She could yell and scream for their parents, and maybe they'd hear, but Shelby had gotten naked in Greg's room and let them pee in her butt... she'd probably get in trouble for putting herself in this situation, with the way her parents took Greg's side.

Greg didn't give her much of a chance to think further on it. Holding her down, he plunged his fully erect eight inches into his sister's pussy. At least she was wet so it didn't hurt much, but soon she felt her urine-filled ass sloshing as he pressed her against the futon. This was the most humiliating thing that had happened to her in her whole life, even worse than when she'd addressed the entire student body in the auditorium with no bra on and the spotlight made her boobs plainly visible through her blouse!

Greg held her down and shoved his cock in and out of her bald cunt. He was being much rougher than the previous time they'd had sex.

"Yeah!" Mike said, watching and jerking himself off, "**** the class president! **** that bitch!"

Shelby stopped resisting since it wasn't doing any good anyway. Greg was smiling as he **** his sister. Shelby didn't cry, she could take a ****, half of her friends had been ****. This wasn't even that bad and she had been kind of asking for it, with what she'd done. Greg pushed his cock deep into her pussy and held it there, leaning into kiss her on the lips. When she didn't kiss him back, he said "Awww don't like it?"

"You're **** me, asshole!" Shelby said.

Greg and Mike laughed and her brother resumed fucking her. She could feel the urine stretching her rectum into a nasty water balloon. It felt so funny in there as she got fucked. She hoped the plug held, but then again maybe a liter of urine exploding onto Greg's futon would teach him a lesson.

Greg groaned and pushed all the way inside her again, and she knew he was cumming in her pussy. All that sperm was firing out right against her cervix. Not only was she getting **** by her brother, he might be getting her pregnant.

As if that wasn't humiliating enough, she felt herself having an orgasm as her brother filled her with semen. She made herself stay still and in his post-orgasm haze, Greg didn't even notice that he'd made his sister cum too. At least she'd avoided that shame, she thought. She couldn't bare for him to tease her for orgasming from her own ****.

Greg rolled off his naked sister and she tried to get up but Mike was on top of her now. He played with her big tits. Shelby was drenched in sweat and exhausted now, her pussy full of her brother's sperm. She didn't fight Mike at all as the chubby boy kissed her and then pushed his average-sized cock in her vagina. She supposed this was **** too but it was more humiliating than painful, even with her ass full of urine. Actually that only added to the humiliation.

Greg kneeled down and watched his sister take the chubby boy's cock into her cunt. Shelby had such a sexy body, it was hot to watch her get ****. Mike pushed his cock all the way in, groaning in delight.

"I can't believe I'm fucking the class president!"

"Stop **** me, asshole!" Shelby said, coming back to reality from her post-orgasmic haze.

Greg climbed up and sat next to his sister naked as Mike had sex with her.

"You're getting **** back-to-back," he said, "This is so hot, Shelby. You're the sexiest girl in school and this is the hottest thing I've ever seen."

Shelby blushed at her brother's horny words. She leaned over to kiss him on the lips as Mike pushed deep and groaned, adding a second load of cum to her twat. She pushed her tongue into her brother's lips, more turned on by him than by Mike, not that Mike was anything to be turned on by in the first place. Eventualyl the Chubby boy rolled off and Shelby stumbled to her feet.

She walked into the shared bathroom on wobbly feet and hopped on the counter to wash the cum out of her pussy. This was a humiliating but necessary task to at least somewhat decrease the chance she got pregnant after taking two loads of semen without protection. Greg came in and watched, of course, never missing a chance to embarrass his sister as she scooped cum out of her pussy then sprayed water up into it to clean it out as best she could.

"How's your ass?" he asked.

She reached back and fingered the buttplug. She could feel all that urine inside her too.

"It held," she said with a shaky voice.

"Did you like what I did to you tonight?" Greg said.

"Fuck you," Shelby said. Her brother just laughed. Shelby and Greg both knew that the answer to his question was 'yes'.