Sometimes gay relationships get to the point where you can try a threesome.
So the guy decided to try inviting a friend to fuck his boyfriend's belly button in front of him.
The friend liked the guy's belly and belly button so much that he decided he was going to have some fun with him.
From gentle navel pokes to powerful thrusts into the poor guy's belly with a urethral probe.
All in front of his boyfriend. A real cuckold.
Damn hot video!