I feel like generally looking at what people are posting gives a good idea about what we want.
So far most people have mentioned:
Consent from Asterion in a way that makes it obvious that Asterion is into sex, and not as a result of MCs power over him.
Asterion being able to top as well as bottom.
Foreplay and casual sexual moments before a big sex scene.
Possible kink, so long as it is optional and is approached delicately, due to Asterion's past.