Let’s go to your room so you can lay down and I can put more force into it.” It sounded plausible enough to me so I agreed. So we get to my room a...d get the movie turned back on so I can watch while she massaged me. I laid down on my stomach and sat on top of me and started rubbing my back. “Take off your shirt” she said.So I did. Then she put oil on my back and really got into rubbing me. It felt really good. She would go so far down my back close to my butt at times I would get a little. “Don’t break the zipper Billy” as his hand stretched the fabric to its limit. And he obliged un-zippering them entirely exposing a white pair of underwear that covered his other hand as Sandra wiggled around on the floor. It was when she reached between their bodies that I noticed it, there it was, hard and confined; my own dick was at full staff. My own flesh and blood, my sister was causing this. I was torn between stepping out into the room and stopping them or continue with my soiled. She had shoulder length light brown hair and kept herself well groomed. Mr. Smith told her that if she wanted to know more she should come in for an interview. She agreed to come in the next day at 3 in the afternoon. Mr. Smith gave her the address and told her to come dressed to present herself well. Beth was nervous but curious. The next day she dressed in a very professional looking business suit that had a white blouse and matching brown jacket and skirt. The skirt came to just above. You just know what tonight is about, and as much you could see the excitement and desire in Liz's face, I know this will be matched by her studs desire to fuck her good and proper. It is at times like this the going gets tough and I have to dig deep into my reserves. I think about what my therapist told me when I initially approached her about having a wife that often strays. After telling my therapist of Liz's long list of lovers she had before we got together, this with having concrete.