I asked her if she likes sex, she blushed and admitted that it was ok. I asked her if she has ever had an orgasm, to which she just shrugged.We chatte... some more and I could see her nipples straining against her t-shirt. I asked her if she has ever kissed a girl. She shook her head, shocked, and asked me if I did. I shrugged and said, “Once or twice.”“How was it?” She asked.“Want to feel?” I replied.Her eyes started to sparkle and she made me promise never to tell anybody but that she would. I want you to prostitute yourself with your own son….In payment I wont tell Dad what I know…….It,s your cunt or your marriage Mom?”“I Can,t Colin, It is totally ridiculous, you are my son for gods sake….. I am your Mother!!.”“I know ” I replied “ That,s why..….I want to know what you are like as a fuck …I want to know what it,s like having my cock in my Moms cunt. Simple be my prostitute and let me fuck you silly, or become my divorced Mom?”Mom stood there weighing her options….either she lets. I guess the neighbors pulling into the driveway next door scared them off." She didn't let go of me. "Matt, stay with me till Daddy gets home in a couple of hours. Please?"I would have been insane not to; here was a young girl clearly in distress; never mind she'd been my best friend's daughter.We sat in the living room and talked awhile, Casey eventually calming down."You know your dad always tells me to look in on you and take care of you while he's gone," I reassured her. "I'm just glad this. My cock was twitching all by itself and I had to stop touching it to hold back from cumming at the erotic vision in front of me. I undid my shirt and took it off then stood up and took off my trousers and pants.The girls looked at me and giggled, so I told them, “Take off your tops girls”, and walked over to them.I reached over to May and pulled her white school blouse up over her head. She in turn opened the buttons on Avril’s blouse and took it off. I reached over and caressed Avril’s tits as.