Got heavy post nut clarity after I had sex with another man in a threesome

So I've been hooking up with this couple for a while , and I've really enjoyed it so far, at least until the last time. In our recent hookups, they kind of talked me into letting the husband fuck me, and it was OK the first few times. It felt good but didn't make me cum or anything. Then during our last meet, he was doing me doggy while the wife watched, and suddenly I came HARD. I wasn't expecting it, and right after the post nut clarity hit me like a brick wall. Went straight from horny mode to thinking like what the fuck am I doing? Felt really guilty and embarrassed, and really just wanted to stop, but he hadn't finished yet, and she was really enjoying the show, so I kind of just pushed through it so not to ruin everyone's mood. Don't know how to feel about it now tbh. Never had much trouble with post nut clarity when hooking up with them before, and never during 'regular' sex with women. I should mention I've only ever had sex with another guy when I've been with this couple. In my 'normal' life I've only had straight sex, and I guess I still identify as (mostly) straight. So now I kind of have second thoughts on hooking up with them again. I'm worried I'll get that feeling of shame again, and I don't know what to do tbh. At the same time I want to keep doing it whenever I feel horny. It's quite maddening. Any advice?