HIS Demon: Various Yandere Demon Slayer (AGED UP) X Demon Marie

Marie traded her human life for His Gift, and what he got was her loyalty and he wanted more, he wanted her to be HIS Demon! Of course, more demons and even demon slayers wanted her to be theirs and theirs alone. He has a lot of competition.

(All Yandere Demons Characters are 20 years old or older, They are aged up, so all demons are at least Physically 20 or physically older, and all demon slayers like Tranjiro and the other 5 final trial characters were 19 when they survived the last trial, and they quickly become 20 in the following year, All yanderes are at least 19 when they are introduce or older)