read a short danmei called 'i can't shake off the vow breaking immortal', and now im imagining a jiuyuan AU where shen yuan transmigrates as a dream demon but is stuck in the dream realm as a spirit/ghost. to get out of this, shen yuan is tasked by the system to reform shen qingqiu through his dreams and make PIDW have a happier ending. once the mission is completed, shen yuan will have his own physical body and can roam around PIDW freely.
at first, shen qingqiu tries to kill shen yuan bc dream demon and all. but slowly jiuyuan grow closer (probably through shen yuan warning shen qingqiu about his future and/or qiu haitang & huan hua palace master? idk) shen yuan also creates nice dreams to make sure shen qingqiu can sleep peacefully at night once he sees how nightmarish his mind is. they even go on a lil date together in the dream realm and shen qingqiu finds himself wanting to sleep more to visit his little dream demon.
until one day the system tells shen yuan his mission is done. so the next night shen yuan informs shen qingqiu that this is the last time he'll visit him. but bc shen yuan feels bad that shen qingqiu might go back to having nightmares, he assigns another dream demon to help him. and then shen yuan fucks off from the plot to live peacefully in the demon realm.
that peace is quickly disrupted when an angry shen qingqiu shows up in the demon realm to track down his sleep paralysis demon (boyfriend)
EDIT: there's already two jiuyuan fics where shen yuan transmigrates as a dream demon called do i deserve this? so irrelavent. (do you want this?) and once upon a dream
