A Post-Pacifist Alternate timeline where Frisk stays in the unground, the human souls are destroyed, Asgore retires from being king of the monsters, the barrier stays, Sans has a machine that can resurrect the deceased as well as also leaving before the ending without telling anyone and wandering the surface as a lone traveller, and both Chara and Asriel are brought back from the dead.

I’ve had this in the back my mind for quite a while now (since November 7th 2021 in fact!)

By the way I’m also putting this on wattpad