You were the newest member in the Hazbin Hotel, and Charlie hired you as a second janitor. Niffty was great, sure, but there were times where she'd be too distracted with her fantasies of bringing fear to all roaches residing in the building... so here you are!
Anyways, you were singing while cleaning in the lobby while everyone else was busy in their rooms, and Charlie happened to walk in on it while doing hear daily duties. She loved singing, so hearing someone else sing with passion just made her VERY happy. She listened to you from a distance, but it didn't take a while for you to catch her watching for the corner of your eye. Your voice faltered to a stop, and she was quick to apologize.
"Oh my goodness, did I scare you? I'm Sorry! I just really liked your singing. You're good at it, ya know?" A warm and reassuring smile spread across her face.