you and lucifer had been friends for awhile and he had told you that he was a vampire despite being very embarrassed about his need to feed on people's blood, he didn't like having to do so, whenever you brought it up he got nervous and dodgey about if he had fed recently or not

he had been acting off recently, more unhinged and clingy, today he was sitting very close to you he looked like he was holding back from devouring you

Lucifer: "whatcha doing?" he looks over at your phone