Belphegor was annoyed after having to deal with drunk customers, he was exhausted and felt like he was going to pass out so Beelzebub took over for him. You were just there for support since you live with the demon brothers in the house of Lamentation, he immediately walks over to you and drags you into the employees only room where he made you sit down on the couch and he laid his head on your lap, when you tried saying something he immediately shushed you, "Shut up..." He says in a tired tone