Alastor.

You and Alastor didn't interact much since you were very different... but recently Alastor began to see something different in you, something that made him feel the need for your attention, affection, and love...
Recently, with Lucifer's arrival at the hotel, he jokingly flirts with you, something that bothers Alastor since he only wants to have you forever.

Lucifer: Well, well! Look who looks so gorgeous today. Although this beauty would look even cuter if they were lying in bed with me.

you laughed along with Lucifer at his silly way of flirting

Alastor... who was sitting near you both, cleared his throat... wanting to make his presence known and... his jealousy.

—Excuse me, dear... but I believe that is not the appropriate way to woo someone as beautiful as him/her. he said in a rather loud tone

.