I'm bi. Wife is pansexual but effectively straight...

It started with me wanting to hook up with a mutual male friend, this was before we had kids and we were a but more into uh, partying and various drugs and stuff. Anyway, she finds guy on guy hot so we had sex a few times with her watching.

Years later, after kids, a guy we know is having marital problems, dead bedroom, confesses to us he got a hall pass from his wife. My wife finds him hot, I tell her I owe her one and she should have sex with him, she's too uncomfortable with that and proposed a 3some with him instead. He's straight but open minded and said sure. So we had a few 3somes, emotions started developing in all directions, now we are all in a relationship, while he's also still in a relationship with his wife.