i know it very well, i've played it a lot :-) i've actually yapped about an outlast au a few times, always with gluskin sukuna, so i'm very cheesed to see more.

so many scenes can be ripped straight out of canon... yuuji has a very nice surprise between his legs indeed, so that's where it diverges (lol). sukuna chasing yuuji down and yelling obscenities, threats, (and more lmfao) only to soften just a little when he drags him out by the ankle, mistaking his crawling away for presentation, thinking his future wife is finally offering himself up... yuuji being so, so feisty until sukuna slips into his womb, and all the fight finally melts out of him.

all the mood flips... augh... sukuna's laugh would fit really well... i have so much to say, but i'm also so tired.

i'm not the biggest omegaverse fan, but i read a few outlast fics that pushed that association into my brain. it works really well with gluskin, i think. the primal breeding aspect of it. wow... incredible stuff...