i wrote this on twt too but differently but
post war shigahaul living a peaceful life, kai mainly takes care of tomura since he dissociates alot and his body has been healing since kai couldn't fix all of him, and kai sits by his bed side all day and tomuras overall more vulnerable than ever, and he just feels so emotional. an when hes better kai still keeps up some habits of pampering him, mainly brushing his hair and cutting his split ends since hes used to caring for long hair ( eris)
and now that his heads clear he really indulges in his touch and takes time to enjoy it since his love languages touch and once kai's done he for the firs time ever call out to him when they do this and it catches kai's attention and they just look at each other for a few seconds before tomuras like, thanks for everything and kai just nods. And tomura realizes he might be in love with him, while he does think its cause he cared for him he also wants to give this a chance. And while hes out on a walk looking for a simple job he really thinks about him and kai, and it gets him all fuzzy so when hes back he gets welcomed by kai and he just keeps it to himself till the next day and as they're doing his routine hair brush he just splurts out i like you and kais hand stops and he repeats it and hes scared kai would reject him but when he looks back he just looks almost hopeful? Almost as if he could tear up over it, and its just that they've both been broken so much they're just really vulnerable and kai has been fond of him and how he looks under the sunset and how his hair flows in the wind, he'd fallen for him. And hearing that he just reaches for tomuras face and gives him a really long kiss, and tomuras just so shocked about it he just cracks out laughing and its such a pure laugh kai loves it
they later adopt a big fluffy dog cause it reminded tomura of mon and have tenko (my shigahaul kid), with tomura working in a nursery being his reason for wanting a kid, overall i think post war he'd be very peaceful and calm.