my nephew stayed with me and my girlfriend for a month, they were friendly with each other so everything was ok, one night when we were alone in our room I made a joke telling her that she could fuck him if she wanted to was she answered she would only do it if I watched, at that point it was only a joke I though but two days after she told me to hide in our closet, she dudnt answered why but was very pushy so I ended doing it (she always end convincing me to do what she wants), she brings my nephew to our room and she seduced him in front of me and had sex, at this point I was amazed about what was happening but what surprissed me more was that she told him that I was ready to fuck him too and actually pulled me from the closet and took me to the bed with him, we ended having a treesome and almost every day after that we had sex, she told me she wanted a younger guy for us for some time and this was just the perfect time, to be honest I was unawae of this but I was alredy into it by that point, it was a nice hot month for us.