I've Been Parasitized by Myself

[No inspiration, fate changes. There should be a door opened and no way home can be found. The world behind the door is full of dangers. When he was dying, he met a monster who was also lost. That was him in a parallel world. He was lost in the endless time and space behind the door a few years ago. In pain and despair, he transformed into an inhuman thing and became "him". The body and soul of those who are parasitized and survived by "him" have parts of another existence rooted in their bodies and souls. Should:… The ups and downs of life are always so sudden. * A strange manual was opened. ["Code of Breeding of Non-Humans/BY Should" Rule 1: You cannot die, otherwise He will make you die again; Rule 2: You can call Him "another me (blacked out)" or "Friend", or use other names if He likes; Rule 3: You have to believe that He will never hurt you, no matter what the situation, even if He calls you "delicious". … PS: The premise of this code is: your name, identity and soul are human beings and should be named as they should. New ["Guidelines for the Feeding of Humans/BY ■■" Rule 1: You need to respect his will; Rule 2: When you really feel "life" from him, expressing kindness and love to him as much as possible will make your relationship better; Rule 3: He is yours! … PS: The premise of this code is: you find him. PPS: ... He is more perceptive than you think. Maybe you should tell your relationship with him as soon as possible. ◤Notes◢ ◆ Narcissus CP, a supernatural story adventure, mixed elements, everything. ◆There is a process of due doubt and speculation until the "other me" is determined, so although the protagonist column already has "deserved", the name will not appear immediately. Please understand●ｽv● Intention: The possibilities of the world are infinite, enjoy life!