My boyfriend and I had a threesome earlier in the week with a guy we found on the internet. We didn't set any ground rules but it was all great. Anyway afterwards my boyfriend passed out on the couch with the guy and I went to bed. About an hour, maybe 2 later the guy comes through and jumps into bed saying he's cold. Not long after he was rubbing up against me and we ended up fucking for a while. I didn't mention it to my boyfriend. I thought about how I would feel if the roles were switched and they had fucked on the sofa while I was asleep (maybe the did, I don't know, I haven't asked) and I woudn't care. I think most of my guilt comes from the fact the sex the stranger and I had was, dare I say it, better than I normally get. I wasn't going to say anything but by boyfriend has mentioned having a threesome with the same guy again so I thought of telling him just in case the other guy brings it up which could make for a very awkward situation. Also, I'm not sure it's a good idea we do it again, at least not with the same guy.