It makes total sense to me for him to be a bottom with how submissive he is. The only way I could imagine him being on top is with a power bottom calling all the shots lol
Some master: "Go on, Asterion. Show me you're not the meek man they've sentenced you to be!"
I believe the term for Asterion would be service top in this case. I feel like most people are unaware that role and position can be separate things.
