Hellooo <3
I couldn't think at something else but Kiuroh's bite on Roan's neck.
Kiuroh's poisoned bite puts Roan in a horny, submissive state. Their sexual intercourses are always consensual anyway. Let's say that Roan needs that bite to keep up with Kiuroh's supernatural stamina (and our King is a very virile man, so... Phew... Kiuroh... shtap!)
Much love
Zel