My Daddy's Boyfriend Can't Possibly Be a Sweet-on-the-Outside, Dark-on-the-Inside Type

(Just a practice story based on whatever I dream up… Read with caution, haha.) [One-on-one sweet romance + Western fantasy + two formidable leads + wish fulfillment + devoted to each other] [Adorable vampire heroine who’s not what she seems × evil god hero who appears gentle but hides a dark side] An Mi, the vampire heiress, finds a handsome little human in the human world and brings him home to raise with loving care (?) Somehow, while she’s raising him, he turns into her househusband. He does her laundry and cooks for her every day, and even voluntarily hands over his “private savings”! He’s handsome and gentle, and his blood is sweet, too. An Mi is thoroughly pleased, and finally manages to win him over and make him her boyfriend. But their happy days don’t last. Can someone tell her why her househusband has tentacles? Wait, why does he tie her up and drag her back whenever she leaves for a little while? Is my househusband not quite right in the head?! An Mi tries to open the door, righteous indignation in her voice. “Pei Qingran, calm down. This isn’t healthy or appropriate.” Pei Qingran looks aggrieved. “Xiao Mi, don’t leave me…”