I saw the thread on Max but didn't comment, although I did agree with the Dommes who stated to do something like that would be unethical in the way you described it since it is truly a "forced" scenario with no prior consent of the sub.

I understand your point about the surprise golden showers (gs), but usually that is not the first time gs or brown has been done to that sub and that is not on their hard limits list so a surprise from another Domme would be incredibly hot. But, what if it wasn't another Domme, what if it was a guy giving the sub gs rather than a Domme.. or what if the guy had never had gs or brown done to him before? I think the reaction would be completely different, and either of those would be just as unethical in my opinion.

However, if there actually was discussion between you and the Domme about this possibly occurring at some point and you gave consent for her to do that at her pleasure, I think it is totally ethical and fine. To put it in perspective, I actually have been in this specific position so it is not just a hypothetical that I am answering. I was a personal sub to a specific Pro Domme for several years (as part of her "stable" rather than exclusively committed or her primary). Sexual contact with men has always been on my hard limits list (and still is) but after a discussion with her on one of her visits to see me, I gave her my virginity in all activities with men as a birthday present (with the express understanding that if I couldn't handle it from a mental perspective, she wouldn't be offended if I had to back out of any future activities).

For about a year and a half, she never took advantage of it then she was doing a session with a sub in the suite we had at a hotel (she was in "the dungeon" bedroom while myself and another Domme were in a completely different bedroom with the doors closed/locked and no contact). During that session, she came downstairs and grabbed the other Domme to add her into the session (with that subs consent, and at extra cost) then a little later the 2nd Domme came down and grabbed me to join (again with the client subs consent, and extra cost).

So, I got informed of generally what was happening in a very matter of fact way rather than asking if I was alright with it (although if I had objected or said "no", I know they would have respected it). I was blindfolded, told to get myself semi-hard and had a condom put on me, then was taken upstairs. I heard my Domme tell the sub to open his mouth (he was blindfolded as well) and the next thing I feel is his mouth on my cock while she tells him to suck, probably pushing on his head or neck by the way it felt. The other Domme then trapped my arms behind me to hold me in place and starts torturing my nipples with her fingers while my Domme pegs the other sub as he continues to give me a blowjob (I could feel it and the blindfold did slip a little so I could glimpse at least part of the scene).

It was completely consensual on the part of the client sub (hell, he was even paying for it to happen), I had given my consent probably 18 months before as that "present" to my Domme and she took advantage of it in this random and unexpected fashion. If I hadn't done that, then I probably would have freaked out and refused, but it was totally in service to her so I fulfilled my obligation without it being a mental issue. This was also the only time I did it and she never took advantage of her right to have me suck another guy or to fuck/be fucked by another guy (so my virginity in those areas is still intact and probably will be forever since I no longer am a personal sub to her).

However, it was that original consent and my ability to just refuse at the moment that makes all the difference in what happened with me and what you described on Max ("If and when the first sub does not go along with forced bi, have you who are dommes ever let him "escape" but with, say cum on his face, but no bi itself?").