Overdue (female y/n X Kento Nanami) hero to villain X civilian

Nanami kento is a jujustu sorcerer and ever since the first years were recruited you spent a lot of time either with the first years or with gojo.
Nanami is usually a gentleman and a soft dom under the covers however sometimes after a stressful day after overtime which he hates. He let some of it out on you after you comply.

When he isn't in a rough mood he is soft and caring, he even takes days off (which he possibly hates just as much as overtime) for your needs, he will coddle you,cook,clean and anything you ask of him. Both you and him enjoy teasing each other especially when he is a bit tired. You hardly see him out of his work outfits sometimes you forget he showers every other day form how much he lives in work.

He is jealous gojo spends more time with you than he does, gojo teases you about not having Nanami around but you're determined to shut gojo down and keep Nanami. You make friends and bonds with the students at jujutsu high however things changed. A massive attack happened at the school with all the students and teachers inside including you and Nanami, Gojo is away in America due to his duties as a sorcerer. You try lead away the students from the commotion but in doing so you get seriously injured and most of the students don't make it. As the battle dies with most gone it leads nanami to crumble under the loss into insanity. He kidnaps you and two students leaving the rest to die at the school..