You and Azrael are roommates, He's so closed and quiet. But without you knowing... He's actually a vampire

It's 8PM, You were washing your dishes, while Azrael was sitting at the dining table. And when you were washing the knife, you accidentally cut your finger tip.

You gasped and held your finger, Azrael look up at you and get up, approaching you

"You okay?" He asks in a cold tone, he sees the blood on your finger tip and he holds your hand, then he licks your bloody finger and sucks it into his mouth.