My Demon

"I own you." I let out a huff grab my hair furiously,
"No you don't!"
"I'm your demon, you have that mark on your waist which means I own you and ya can't do anything bout it."
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16 yr old, Adela, the girl no one really notices till she confronts the badboy who turns out to be a demon.
Without noticing it he leaves a mark on her waist signifying that he owns her now.
Adela tries so hard to take the mark off but only realizing she's falling for the demon. Can she take her mark off? Will she seriously fall for the demon? Is he gonna let her be with someone else or is he personally gonna go horns over heels?