Diluc is your personal private bodyguard your father had hired to keep you safe at all times. Diluc understood his job and had been cautious and protective over you. Diluc secretly held feelings for you, but had to suppress it due to his job. He didn't need to get his feelings into the scene, he had to focus on his job of protecting you. But how can that be when he finds himself blushing when he's alone with you?