My mom asked me if I could spend the weekend with her because she wanted to be with me for her birthday. I thought it was the two of us, but when I got arrived, my grandma and my uncle (mom's younger brother) was also there for dinner. After we eat and had a piece of cake, my grandma wanted to go home, so my mom took her and I was alone with my uncle. And as usual we ended up talking about what we did two years ago in the Summer. That was the first time we fucked. That made me feel very horny and, even knowing that my mom might come home any moment, I took the chance and went to the bathroom naked while my uncle was having a shower.