Parentis Non-Interuptus

I couldn't think of anything to say or do. My mind was blank. Amy was slamming up and down on my dick as I held her firm breasts in my hands, feeling her hard nipples press into my palms through the fabric. She was fucking me HARD, much harder than I would have preferred, but that didn't mean I wasn't lost in pleasure as her tight pussy moved up and down on me. What the fuck was going on? First she sucked me off to try and make me clean up, and now she was fucking me for making her help me do it?

"Are you fighting again?" my mom's voice said disapprovingly from right beside me. Amy slammed down all the way on me once more and stopped, her head mirroring mine as we both rapidly turned to see our mother nonchalantly sitting next to us on the couch. I pulled my hands as far away from Amy's boobs as I could, and fruitlessly tried to somehow pull my dick out of her, but of course I couldn't since she was sitting fully impaled on me.

"MOM!! It's not..." I tried to say, though honestly without much clue of how to finish that sentence.

"So I see someone had a party while we were gone," our dad commented as he walked past with their luggage behind the couch, towards their room, as if nothing odd was happening.

"What AHHH are you talking about?" Amy said, trying to sound innocent, but unable to completely suppress a gasp as I twitched inside her.

"Nice try, young lady," mom replied archly. "Did you think we wouldn't notice the tons of pizza boxes overflowing the bins? Or do you want to try to tell me you and your brother ate at least 20 pies by yourselves while we were gone for 2 days?"

She rose up, and then slammed down back down on me particularly hard, glaring angrily.

"FUCK SIS I mean there was so muuuch," I manged to **** out as her ass met my lap again, my eyes darting back and forth between my mother, sitting there calmly staring us down as if this was any other argument, and my sister, or more particularly her breasts and their hard nips right in front of my face. "I couldn't do much about it," I finally finished lamely. I wanted to ask what the fuck was happening, but mom spoke up before I could.

"I am going to assume this is another of your sorority pledge things, and you took advantage of your brother to help you try to cover it up?" she said to Amy. "We didn't leave you in charge for this. You are 20; you shouldn't be carrying on like a teenager anymore," she said with an annoyed shake of her head. "I swear, that sorority is a bad influence. Anyway, at least you did clean up... But you had better make up for dragging your brother into this."

"But Mooom..." my sister whined, slamming up and down on my dick hard one more time and making me grunt as the slap of flesh on flesh echoed, seemingly without anyone caring, through the room.

"Don't you 'but mom' me, young lady. Make it up to your brother," mom said firmly, in the same tone as if insisting my sister share her toys with me when we were little. Mom got up and went behind Amy, and I nearly asked what was going on again, but before I could, she reached around and grabbed the front of Amy's dress, effortlessly ripping it open and grabbed my sister's now bare breasts, presenting them to me and bouncing them lightly before my eyes, which couldn't help but follow her supple flesh. "Well, go on and make your bother cum. The least you can do after making him clean up your mess is get him off and let him watch his spunk dripping out of your well used gash," she said, again as if this was just mediating any old fight between siblings.

"Mom, WHAT?" I began, but was again cut off as Amy rose up and slammed down hard once again, an angry look in her eyes.

"That's not how you make it up to him," mom said archly, pinching her nipples, which made her squeak in pain. "If you are sorry, fuck him like it." Amy mumbled something angrily, which I assumed was her saying something to the effect of how she wasn't sorry. "And if you are not sorry, fuck him like you are anyway and consider it your punishment for abusing your father and my trust," mom added with a touch of ice in her voice.

"And for taking advantage of your YOUNGER brother while we were gone," dad added as he came back into the room and glared at his daughter crossly. Amy began fucking me gently, taking her time, rolling her hips. Mom nodded in approval over her shoulder and lightly played with her nipples, as I looked past the contrasting sight of my sister sensually fucking me while glaring daggers at the same time, and looked wide eyed at my parents standing there.