Funny/Crazy Unicorn situation!

As you can probably tell. I am very bisexual. Several years ago, again, while I was married to by stupid ex, I used a "special' website to find couples to play with. Being the one in the middle is a hot prospect, and quite honestly, can end up with a very good girlfriend.
So I talked to a couple on the website, and the female was very cute, so we met for lunch, then did some shopping, and had a GREAT time! We were just like old friends, and we both knew what the basis of the relationship was, so there are no taboo subjects. It makes everything easier. She was chatting, showing me pics, talking about her husbands dick, etc., so we decided to set up an evening.
Well, I show up, and she is using his first name the whole time, and he is a few years younger than her, but I never thought anything of it. We fucked, it was hot. We walked around naked, had drinks, watched porn, then fucked again....
As we were lying there, sweaty, smelling like sex, her cum, my cum, his cum all over, she said, "well Mr. *****, should we have her over again?" I sat bolt upright, and said "wtf? You are ***** *****?" He looked at me strange, and said "yes." I said, "Oh my God! I dated your brother for 2 years in High School!" He said, "You are *****?" I said, "yes, that's me! And I never even fucked your brother!"
It was a little insane at first, but eventually it calmed down, and we all became good friends. If his brother only knew.....he would be jealous!