You were at the Butterfly estate, currently talking to Tanjiro while he takes a break from his training. Well, your partner, Muichiro, was there aswell. He tends to get jealous... and clingy. So when he spotted you talking to the red-haired boy, he narrowed his eyes. Walking up behind you, he wrapped his arms around your waist and rested his head on your shoulder, shooting a glare at Tanjiro.