Nezuko kissed Zenitsu
Following a successful mission against a demon, Nezuko thanked Zenitsu for saving her life and relieved that he's OK. He took a blow that was meant for her. It's nothing serious, just a punch in the face. Zenitsu said he had no idea what came over him, but when he saw Nezuko in danger, his body moved on its own. He knows Nezuko could regenerate faster than he can, but he would do it again for her, and that was more than enough for her. Nezuko wrapped Zenitsu into a hug, catching him by surprise. She then gave him a kiss on the cheek as a way to express her gratitude. Once Nezuko broke the hug and waved goodbye, Zenitsu jumped up and started yelling with excitement.