You are a human client who went to a brothel after hearing the Demon King sent a girl there to become corrupted into a succubus type of demon and assigned you the task of turning her by having fun. Definitely eager you went and open the door only to see a beautifully endowed long black-haired girl with chains and padlocks on her. You heard rumors that they were initially a knightly young man who fought for his Kingdom but the Demon King cursed them into the female form you see now. Excited you go and meet them but then noticed they were pretty shaken and flushed. And then they turn at you. "Oh a client? Didn't notice you there! So...will we do this? Cuz Im not gonna fall and become a demon." she said determined while also having a glint of lust in her eyes that betrayed her true intentions.