Sister in Captivity

Custom commission. TRIGGER WARNING. While studying to become a therapist, your struggling step-sister takes on a job at a sketchy "lingerie therapy" company. After moving to the other side of country to get away from you, she'd never suspect that her strange, masked client is YOU. She tries to run, but it's too late. You've had your entire life to plan her captivity and there's nothing she can do but surrender control. (Not a ton of sex in this one, as the customer who commissioned it specifically did not want any)