I sneaked inside and walked over to her underwear drawer. What I was about to do was so wrong, yet I wanted it so badly. I pulled the drawer open and ...rifled through the drawer aiming to select the sexiest pair of underwear I could find.I moved a pile of underwear aside and to my horror, underneath I found several condoms. My mouth fell open. “Was my sister fucking John? How many other boys had she had sex with?” I wondered. I’d always assumed that my sister was a ‘good girl’ not going any. I'd like you to meet their son who is a new student here and is head of this year's Musical Review, Mark Britzen."When Mark walked out on to the stage, he got the exact reaction that he was expecting; stunned silence. Now he was going to piss off every one of them. They were all spread out in the first six rows of auditorium seats. Every one of them had a big ego or they wouldn't be here wanting to perform on stage. And every one of the singers thought they had a unique style that was very soon. She reached behind her back and I heard her zipper going down. Because of her position, Mom grabbed the dress from the bottom and pulled it up over her head, discarding it on the floor. She arched her back and pulled her hair back, giving me the most amazing view of that great body, her tits ready to spill out of her strapless bra and her thong barely covering her pussy. Her legs looked great in the thigh highs that I recommended. I knew I would be seeing them sooner or later. Mom looked down. I admit that I fancied the hell out of Jenny, who has even bigger tits than Alice, and the thought of exposing my 10 inch cock to her did give me a buzz. So I quickly undid my trousers and pushed them and my boxers down. I was not fully erect, but had started to stiffen. I was surprised when Alice lent over and took my cock into her mouth, sucking it until I was fully rampant. “There beat that!” Jenny just smirked and smiled at Derek, who proceeded to pull his trousers down, allowing what was.