After the war y/n had recurring nightmares, a loop of katsuki’s death even though Bakugo lived. Katsuki is on the opposite side of y/n’s dorm room and a night he wakes up to hearing her fall off her bed gasping he which isn’t the first time it happens, he pieces it together and finds out just how much his death would’ve hurt her. They grew closer and now he wanted to be the one to comfort y/n when they woke up with a nightmare.