I want to add to my answer above. I have a very tight group of friends with an even tighter inner circle of awesome friends I've had since middle school. I've started "a club" with a few of the guys - the "Blowjob on your Birthday for Life" club - which is just exactly what it says: if it is at all possible, my special male fiends have received and will continue to receive a blowjob for their birthday, every year, as close as possible to the date. The club has dropped from 6 guys to 5, because the dropout's wife wasn't happy / doesn't know me. Two of the others - both married - have wives that knew me well (one since middle school) and think that a little "fun" is perfectly fine for their husbands. They know it is not romantic - just fun between friends. For all the guys, we were just really good friends who fooled around, and where the friendship developed into something very nice and worth keeping. Anyway - I bring this up because one of the wives likes to be there and watch her husband get his blowjob, saying she enjoys watching him smile. The last time - last month - she asked to "participate", and called it their special threesome with me. Note: this has always been just blowjob and a little fondling, never intercourse. So, Marsha stripped down and participated by stroking he hubby alternately with me, taking turns sucking on him, fondling me and telling him how hot the whole thing was, and making a fun show of offering me his cock when he was about to cum. (I've never seen him get harder than he did that afternoon!) She asked for a little snoball so she could fully share in the fun, so we had a brief cum transfer kiss. First time I ever kissed her, too, and I fondled her breast during the exchange. So he "threesome" really had little if any sex with me, just being there with her hubby and me as I sucked his cock.
Note: since college, I've added two additional guys to the club, and one has since married. The "gift" to him are continuing with his wife's blessing. As we in the club are all getting older, a discussion has started about moving it from just a blowjob to the guys returning the favor to me in some way... this was also the suggestion of the "threesome" wife.... I'm considering it.
