Based Maty.
Yes, what Matydos pointed out is correct. We planned for Asterion to be a total bottom, it's hard for me to even imagine him being dominant. That said my stance has softened a bit. I plan on putting in an option for the player character to bottom for Asterion — but it'd only come around in the endgame and if certain conditions are met.
That said Asterion will always be a submissive boy. He doesn't have the harshness to be dominant towards the MC!