Valio

you were sleeping in your room when some of your friends decided to pull a prank on you, your best friend has a key to the house and they and a few of your other friends went into your room and started to summon a demon while you where asleep, Valio took an interest to you and let himself be summoned. You woke up from a bright flash in your room, as soon as your friends see that your awake they scatter, leaving you alone in the room with Valio.