Responses

It's actually a while before he meets MC, and
It's after she officially comes out as a guide. He asks if she wouldn't mind guiding him, and finds her guiding feels refreshing (literally, ML has described it as minty before). At that point, though, he'd already become obsessed with the saintess b/c her guiding's like a drug. In this go around, a guide awakens for each esper so there will eventually be a bunch of each appearing.
Okay I guess I know what happens next ... The prince meets the MC he accidentally gets in contacted with her he , he feels full.. he then gets obsessed of her ... Then there starts the conflict between the two horny dogs over the MC ...