Weekend before last, my wife's Best Friend Forever (BFF) was visiting us. I have always found her BFF quite attractive. She's also very intelligent, and perhaps more outgoing and direct about what she thinks than my wife is.
I'll spare you all the details, because I'll probably write it up for Altarboy's site. But the bottom line is that Friday before last, my wife and her BFF were having a little wine and talking, and then she calls me in and has me show "it" to her BFF.
Then Saturday morning when her BFF was going from her shower to the guest room, wearing only a towel, I was coming out of the bedroom and we sort of met in the hallway. Well she walked right into the guest room, turned to face me, and dropped her towel with a huge grin on her face. At that point she just dressed while I watched. Later that afternoon, I gave her oral - it was wonderful!!!

I'd always wanted her, and for my first sexual encounter with her to be with me in chastity servicing her... wow....! (she and my wife are VERY close.)
Later that night my wife had me strip down naked except for my chastity device and be their butler. They were carrying on about how I wasn't going to be alone for long because she was going lock her hubby up as soon as she got home. Apparently has has quite a problem with porn and masturbation like I used to. They even had me help them find a good device for him. His wife is planning on taking advantage of his PA and I get the sense she's going to be keeping him in it a long time to start with. She was not happy about his little problem.
I've never had anything like this happen. I think the most embarrassing part was not showing myself - once I got over the awkwardness, I really liked being naked with them like that. In fact it was really, really cool. My wife and I talked about it after her BFF and left and I told her that I really loved it - she seemed to be quite pleased with that.
But the embarrassing part was where my wife basically made me to admit to her BFF about all my problems with porn and masturbation that I used to have, and how I was such a better hubby for her now that I'm locked up. Isn't that funny? I didn't mind her friend seeing me. In fact I loved it. What I minded was having to admit my short-comings.
I'm sure there's a lesson in this for me somewhere. I'm still reeling a bit from the whole thing and I haven't quite got my head around it all yet.