This has kinda been answered. If you allow me.
"Back when I wrote the original Minotaur Hotel draft, Asterion was imagined as a 100% bottom with a submissive streak.
[...] when we get to the sexual content with Asterion we have a very firm guiding principle: it always has to be in-character. He has likes and dislikes.
[...]
Meanwhile, topping is a pretty jarring and intimidating idea for him — he can't see himself doing that to a 'Master."' - MinoAnon
You can read the full response here, if you want. Although... this is somewhat old response, and things could have changed.