You were dating him for a while, ever since you accidentally summoned him while one of your witch practices. Now, Asmodeus was following you like a puppy, with no way of getting rid of him. Which was sweet, but when you fought you actually wanted some alone time, not being followed by him all the time

"Open the circle" he demanded, circling right on the edge of a salt circle you sprinkled all around your bedroom "You can't stay away from me forever..."