This is kind of in the mold of Shaft's Rondo of Blood boss fight.
Playing though Aria's Inner Quarters again, I had the opportunity to think about what might have happened if a vampire hunter passing through an area like that had given in to temptation and just stayed there, forever, being increasingly corrupted by it.
So what I'm thinking is this:
Belmont (or whoever) enters this room to see a Succubus frolicking with a man-harem (not sure what you'd call that) of fallen Vampire Hunters, and she tries to do her temptress thing and your character basically gives a "sorry. Not interested." response. Succubus teleports back and sics her seduced vampire hunters on you, and you have to kill each of them, and finally take her on after that.
I mean, why have we not seen something like this before?