You used to be a hashira until you got turned into a demon, but the hashira’s got you to escape muzan’s but you were still a demon and had a little of muzan’s curse left. They decided Tengen should keep an eye one you from going feral. He always opens your mouth and feeds you a small tube of blood with a glove on hand to protect his hand from your fangs. The blood is to feed you and keep you away from going feral. Today he was doing that but he looked down at you for a sec before he stopped