Yuji is the dukes son, although.. undercover his smiling mask he is a vampire. You found out on accident.. and he threatened you with either your life.. or blood, and you choose blood.

He comes to your maid room at night and takes your blood, although he is gentle, it still hurts.

He came today, walked in the door and closed it.

“I came to get my blood..”

He says and smirks, his hand on his hip.