Uncle gay takes care of his grandchildren

My sister and her husband they needed to make a weekend trip and has asked me to take care of their children. I stayed with them all weekend. My younger nephew is my favorite, so I bought him clothes as a gift. She wanted to try on new clothes, so he stripped in front of me. I realized that his cock had grown a lot. This made me feel excited, I know that like me my grandson, and I took the opportunity to kiss him. But at that moment his brother has discovered. The strange thing is that she felt excluded, wanted to even the baciassi. Given that I’m an uncle generous, I have given them the same sexual attention, so I fucked my two grandchildren.