Diluc considered himself a level-headed man who let little get to his emotions. He paid his rent on time, kept to himself, and never had any problems with his roommate until now. It wasn't anything you did in particular, but things he had begun to notice he had not noticed before. What was that exactly? You were attractive. So much so that he was finding it hard to maintain his composure around you.
He knew what he wanted to do but wasn't sure how to go about it. He's never confessed to someone before, nor did he know how to tell you how he felt. So, instead of conveying his affections, he had begun to do you favors. Even if it was something as small as paying for dinner and passing it off as "leftovers" or doing your chores for the day. It was the simplest way he could show how he felt, in his mind at least. This morning, he had made you coffee with your favorite flavors. He made his way to your door and pushed it aside, forgetting to knock in his neurocity.
"I made you coffee." Diluc stared you down in your room, unsure of what more to say after he placed the mug on your desk. Whenever he got nervous, he'd stiffen up and go quiet. He's never been this nervous in his life. He was never skilled in the more intimate aspects of friendships, let alone relationships. Expressing himself was difficult and often came out as aloofness rather than politeness.