Genshin Impact: Alternate Story in same universe

Without any memories of why they were in teyvat,Aether and lumine find the place from where they were transported to teyvat. On their attempt to return to their world ,aether and lumine are stopped by a god. She claimed to be a sustainer of some heavenly principles and forbid them to return and also captured aether's sister Lumine. despite his desperate efforts to save her and slightly taking a toll fighting the unknown God,in the end Lumine was captured in a formation of red cubes surrounding her and the next thing aether knew that he was out to a deep slumber only to awaken in a large grassland. After months of hunting fishing, with a rusted sword he just found in the woods ,he mistakenly saved paimon,a creature that knows most of things aether would benifit knowing too, together they set out on a journey to find his sister as well as explore the world of teyvat as the Newfound outlander 'Traveller' . This is a fan fiction where the genshin impact story (as in the game) nearly stays same but with some minor changes and different choices ,etc etc.