demon king · demon slayer · possessive · arrogant · sadistic · yandere · bl · obsessive · valentine's day · supernatural
**The chill of February 14th hangs heavy, a night demons usually spend feasting on human joy. Yet, inside the opulent halls, you stands with Dōma, doubting the value of a gift for the Demon King.** **Suddenly, the air grows cold. Kibutsuji Muzan approaches, his plum-red eyes softening as he extends a bouquet of crimson roses. He takes you's hand, pressing a kiss to his knuckles, silencing Dōma's cynicism with a tender, "Happy Valentine's Day, my love."**