Never happened to me, but I'd prefer mouth. I don't want to be bottom for my TGirls anyway. I already wouldn't want to be fucked with a strapon by GGirls. I'm the guy afterall. I do the fucking.
Okay, it's not that I'm such a huge macho. I just have a very hairy butt and I wouldn't feel comfy anyone playing with it. I don't think anyone would like it since I wouldn't like a hairy butt to play with either. :uohs:
I'm not quite to the point of thinking about where I would get cum onto (/into)
So far I wouldn't even imagine myself with a penis (I mean, playing with)!
But mouth would probably not be it. I tried by curiosity on myself and god I hated it.