The event won't trigger if Xer is dominant (focused on his work). Just chat with him so "he can be himself", and come back naked.
I am sure this happen after he become a werewolf but. I think he said something like he was sure I wanted it even if the protagonist been surprised and "pretending" he didn't want this. If my memory is right.
I just do not remember what I did. I never get that scene again. Could be because I end close to Bernard or need of some hability in high level.
Opposite way. I got a scene of Rhot attacking me in a rain night at my house in place of the orc scene. This one I remember how I find.