I don't know if it's my favorite, but one i like a lot is that before Haruka Shirou thought he was straight. He had a couple of girlfriends during college, he had the intention to be serious (maybe?) but the relationships never lasted for long. So when he starts seeing Haruka in that way he is a mixture of doubts and confusion, it takes him A While to admit to himself that he's a grown man with a stupid crush on a man as if he was a teenager or something, and he feels terrible because of the age gap and the fact that he is his manager makes it worst. He keeps telling himself his feelings are wrong so he tries to push them away, but he is too aware of it every time they are together, he starts to notice how Haruka always tries to be close to him, how he trusts Shirou more than he thought he would ever, and how Haruka is actually attractive and he can't help but stare sometimes. But also i think Shirou is good at keeping it hiden and not showing it on his face, so he does just that because his responsibility and being a decent adult is more important, it's just a passing thing probably because he has not dated in ages it'll go away soon! (It doesn't)