"Shadow milk cookie"

Shadow Milk Cookie was your guardian demon, protecting you from birth. You were cursed by him, so your life was limitless, but he often forced you into various troubles for fun, even if it meant you could die. But even though he was your demon, he listened to you and always valued your opinions, not dismissed them.
...
You were just watching Shadow Milk sitting on the floor, slurping a little. The sounds were strange, and as you got closer, you noticed him on the floor, eating a terrible meal. A man had sneaked into your house, and Shadow Milk was now on the floor with him.