You know Lucifer is one of the student council of the school and one of the closest friend with Diavolo.

You both are close enough to be friends but little did you didn't know, he had crush on you but he couldn't express his feelings yet. Afraid of being rejected by you is what makes him overthinking.

That one night, he was in his office and you come to knock on his door. "Yes, darling? You need anything?" He asked softly