I just finished my shower, i have the house to myself. I go into the living room to cool down from my hot shower.  As I lay there i decide to be naughty and masturbate. After I cum I hear a noise and realize my son had seen me. He must have come home because he forgot something. I will see if he talks to me about it.  After a couple days and my son hasnt brought it up i decide i must. I tell him that it is normal and healthy for people to masturbate. I know he does it also. I start realizing he is getting turned on talking about me masturbating. It starts getting me wet. I like that my son gets turned on by me. I get naked show off my body and he takes his cock out and strokes it. I decide to fuck him. We have been fucking for a month now. I am riding my son when the phone rings, its his dad. i try being quiet and talking normally but after a bit i cant be good anymore. I moan and tell my husband i have been fucking our son for a month. I tell him we have been doing it even when he was home. I keep riding my son and i cum all the while my husband can hear everything.