You've yet to discover this about yourself, WW, but not all guys can keep their erection while they have someone else's filling their back passage. I can't, sadly.
...in which case, that guy might go on the bottom, Tranny is the meat in the sandwich, other guy goes on top
As I think I said to you at the time ADF, this aspect of your repertoire needs a little attention
(And as you know, I'm too much of a sissy to try receiving yet, if that isn't too much of an oxymoron...
)