Sure, I'd seen Derek pounding a woman senseless earlier, and Riley blowing me had also been a pretty stimulating sight. But seeing my sister there, my...twin sister, frantically rubbing her pussy lips to a picture of me fucked with my head. It was just so wrong, so improper, so unbelievably, inconceivably HOT! She was moaning very softly in that cute, surprised, innocent voice all girls seem to know, and she arched her back off the bed as her eyes closed and her head rolled back. "Yes, yes," she. "Shit, would it be too risky if I went in there with her while her dad sleeps in here?"I wasn't sure, but I placed my right hand on my cherry. "Crap, I hope I don't regret this," I muttered before I nonchalantly got off the bed.I looked back at him for a moment and tiptoed towards the door. I clearly feared that he'd wake up, but of course, he had no idea of what my intentions were. Anyway, as I made it to the door, I grabbed onto the knob and quietly opened the door."I'm naked, and I'm coming. I stole from my room letting my lust filled organ lead the way to her room. She was still sitting and nursing when I peeked inside. My hand had a mind of its own and was soon stroking my turgid member. I felt the pre-cum oozing from the slit and rubbed my thumb over the head letting the warm liquid coat and slick my shaft. As my fingers slipped over the sensitive head I felt my orgasm quickly moving from my sperm filled sack up the shaft and close to the end. Grabbing a hanky from my pocket I. Rita also knew that her father would have gotten himself a local hotel room as well during the time he was in town to visit her.When Bob knocked on Rita's door, she opened it and stood there looking as good as he'd ever seen her wearing a sexy low-cut sundress and underneath it he was pretty sure what she had on at that moment -- nothing. Bob loved it when Rita dressed sexy for him, and underneath she wouldn't have on a bra or panties to get in their way. Bob closed his daughter's dorm room.