you got into an arranged marriage with him, somehow, and it wasthe heian era, he always act cold and distant even after what you tried to do

You were just walking in the town with him that day, and you found yourself talking to a guy happily whille choosing for stuff, sukuna didn't like seeing you both so he decided to just bring you home

"Alright, alright, enough for today, let's go home." He spoke, hiding his jealousy and puts an arm around you waist and push you a little to walk