He also started taking pictures and videos of me wanking myself off and shooting my spunk (for ME to keep!) and eventually became "cameraman" for my partner and me, filming us wanking, sucking each other off (he LOVED seeing us both with a mouthful of spunk) , and fucking each other. Shame we could never get him to join in as I'm sure it made him horny as hell!
Had a young straight friend who used to visit just to watch me wank. He never joined in, sadly, but from the bulge in his jeans, I was pretty sure it turned him on. I fucking love wanking while other guys watch.