Oscar will have that reaction often when it comes to Asterion. He fully expected the minotaur of legend to be a cannibalistic beast and he'll learn Asterion is nothing like that. It'll be a good shock, but a shock nonetheless.
That said, yes, Oscar has a very take on things. Regardless of his emotions towards P, Oscar would be mainly interested in getting close with other mythicals instead of humans. He'll be fine with the MC, because he's a very reasonable and respectable authority figure, but his sentiments are complicated.
Meanwhile Asterion actively enjoys humans in a way few do. The idea of dating one doesn't really cross his mind, he just really adores everything human.