My neighbor fuck his wife's brother

My neighbor is a straight guy who turns me on a lot. Knowing he likes to jerk off on porn when his wife isn't home, I decide to film him. But going up to the window, I end up catching him fucking his wife's brother on the couch in his living room! Horned up by what I am watching, I lose focus and my neighbor ends up noticing me. Instead of beating me up, he invites me in to get a better view on what is going on. I end up taking advantage and sliding my own cock in his ass and pound him good.