Instead she grabbed the towel, leaving him standing there with his erection and a very red face. She looked down at him. “My you do seem excited. I ...onder who you were thinking about. It must be someone very fit.” Joe tried to cover his embarrassment and his erection but she stepped forward and began to undo her blue blouse. Quickly she had exposed her bra, which did little to cover her large tits and Joe couldn’t take his eyes off them. “Put your hands on them if you want.” She said. Joe. It was no use. So I pulled her off me, and proceeded to fuck her until I came. We went to sleep and again did not speak a word about her mom, or what might have gone on there. The following Thursday could not arrive quick enough. When I arrived, I was already hard. As my mother in law greeted me at the door, she playfully kissed me on the cheek and held my arm as she ushered me in. This was new, but I guess things were becoming a lot more familiar between us. She didn't even offer me the drink. Intimate. That was an eye opening experience for me too. Even though I was trying to be objective, I felt myself being drawn towards Nancy in a serious way too. I wasn't quite in love with her yet... but I was definitely in lust.That fateful date we went out to a dance club and then to a nice restaurant. After eating, Nancy mentioned wanting to show me her place. She was sitting next to me as I drove, and before we got out of the parking lot of the restaurant, her hands had found my pants. Our orgasms seemed to last for ages but I guess they didn't, once they subsided Susan opened her eyes and smiled at me, this was nothing like the sex I had had with Kate which was always fast, this was a special euphoria shared between brother and sister. Susan lifted herself off my cock and headed over to her own bed and we drifted off to sleep.In the morning we woke to the alarm and put our PJ's on to head down for breakfast, it was then mom revealed that I had been expelled from school. It.