This is it.

The vampirit has gotten to Lucifer and his thirst for blood has pretty much taken over him. All the others were locked away from the vampirits, but Diavolo trusted Lucifer to not let his lust for thirst take over, but seems he has failed.

He had excused himself a few minutes ago to go to his room, probably to try and not harm you.

You received a text from him just now, he was asking if you could come to his room. you might wanna be careful not to be drained from your blood.