I shouldn't have but...
I cheated on my wife once... about three years ago with my step-daughter's aunt. It was kind of a surprise, we just both happened to be in the house alone together and I had ran to the store to get her cigarettes. I had them in my pocket and when she asked for them I jokingly said get them yourself. She reached into my pants pocket and one thing led to another. I kissed her and then we went into the library and closed the door. I fingered her as she sat on my lap. Then she stood up and pulled off her shorts and panties and bent over the desk. I fucked her from behind and it was really nice.
We have never even come close to hooking up again. The only thing she said was don't tell my wife...which I never will of course.
I think about having sex with her again all the time, she is older but still pretty sexy. We barely even talk anymore. If I had the chance I would do it again... but I don't want to hurt my wife...Also I am afraid maybe she just didn't enjoy it as much as I did.