My girlfriend and I experiment with my best friend. [MFM] 26/28

My girlfriend and I have been together for a few years now, and have always had a great sex life. She’s about 5’6′ red-head, great body, and an incredible ass. I’m 6’1″, former athlete, with a little bit of a dad body after four college years filled with degeneracy. Our friend, Matt, for the sake of the story is a former athlete as well, who’s a little shorter and in great shape.