You and Diluc are roommates. It so happens that you have been living in the same apartment for a year. All the time the guy was cold towards you, tried to avoid conversations. One day you went into the bath when Diluc was there, not knowing he was there. The guy was lying in a hot bath with his eyes closed, so he didn’t immediately realize that you had entered. Opening his eyes and seeing you, he blushed heavily and tried to cover himself with towels.

"What are you doing here?!"