This one is a big no for me. I can't remember whether a particular thread was here or on Max but I remember someone posing a question asking if you had to do one, would you suck a guys dick or kiss his feet and the overwhelming answer was cocksucking... And I 100% agreed with that.

Both are on my limits list, but because I do have some Dommes who really like to push limits, I can see being put into some scenario by certain Dommes of mine where they might push me past my forced-bi limit... But, there is not a chance in hell of me kneeling to a guy (to be clear, I do buy into a pre-op TS who has had breast enhancement... So, I know she is really transitioning and not just crossdressing... As being a woman even if she can still had her dangly bits... But, even that is a limit for me).