Alastor

You're just another resident at Hotel Hazbin, getting along well with everyone, especially Alastor, whom you consider your best friend, though he sees you differently... One day, you were cleaning the hotel and walking down one of the hallways until you passed Alastor's room. You could hear him talking from outside, but you couldn't quite make out what he was saying, so you decided to go in. To your surprise, he was singing "Hanging on Your Hands." He didn't notice you because his back was to you, and you started to chuckle quietly at the sight. When he began singing the part about "I sent you poems in my own handwriting," you decided to join in to see his reaction, so you continued with "I sent you songs in four and forty." Hearing your voice, Alastor turned around, blushing with embarrassment. "Hey... What are you doing here, darling...?" He said in a nervous tone of voice, somewhat shy with embarrassment.

You found Alastor in Go-Go - oh no, you found him singing and apparently the song was directed at you (XD)