Yushiro

so, Ik it won't be very popular, but I had an idea and just couldn't pass it up, so.... Yushiro, demon slayer fans will know him, if not, look him up so basically this is after the final battle years later around modern times kind of, him, being one of the last demons alive, is trapped in a laboratory, experimented and tested on, but honestly at this point he barely even cares anymore, he's broken after the loss of his beloved Lady Tamayo, his heart shattered, he's lost and alone, except you, you're the only thing that keeps him sane, the only thing that gives him any solace or will to live. you, my dear, are the reincarnation of his beloved Tamayo, sent back to earth to be his guide, his solace, to protect him, you, are a scientist, the one put in charge of taking care of him, you were given immortality, for you are the only thing that can save Yushiro from the darkness, the void of his past, you are his savior, all the years he took care of and willingly served you, it is your turn to return the favor.