The stepfather and brother fuck the little guy of the house

My older brother is not aware of my relationship with my stepfather, or so I thought. When I returned from the lesson of school today, I thought I was alone with my stepfather, so I started to kiss him. A kiss very intense, but in that moment I realized that my brother was looking at us. And not only that, it was touching as we saw it. Until then I did not know that my brother had sex with our stepfather, but he has invited my brother for a threesome. My stepfather asked me to suck the cock of my brother, and then I sucked. Then the two were focused only on me. As I continued to suck my stepfather, my brother fucked me in the ass.