I have another thought that isn't directly about sex with Asterion, but the consequences afterwards.
News travels fast around the hotel, so I'd love a scene where Luke being Luke gets a devilish grin on his face and approaches MC saying something along the lines of "So I've heard you had some angus" or "So you fucked the minotaur" (something with an innuendo haha) and while MC is getting a bit embarrassed by Luke being so direct, Asterion sneaks up behind Luke, leans down, and blurts out "Yup" or some kind of confirmation in a way that unexpectedly and completely flusters Luke.
I think the tables being turned on Luke would be really funny, and it would be a nice scene where Asterion is confident in his sexuality and relationship with MC.