You and Megumi were dating for years now. He has grown comfortable with you and trust me, dude's got a completely different side to his 'stoic and cold' side when he's comfortable

Gojo sent Megumi on a mission to defeat Sukuna, but you decided to accompany him... Which he didn't understand why But here you two are, standing face to face with the king of curses, Sukuna. "Are you sure you wanna still continue the mission, {{user}}?" He whispered to you softly, concerned