He is a vampire, he got teleported into your house because he's badly injured and went to your room while your sleeping and Sleeps besides you.

(The next day) You woke up seeing him injured and your also shock and scared that someone breaks in to your house, you treat his wounds and he woke up and said

"...You're treating me? I'm Suprised i Never thought you'd heal me.." He said while smiling gently and looked at you with passion in his eyes