My gentle and super timid sister-in-law is actually a masochist who does whatever I say! She's not a slut, but a submissive one who's my sex partner! Even though my parents are around, she can't refuse me when I want to have sex, so she lets me sneakily fuck her inside her skirt and even lets me cum inside her! The more intense the situation gets, the more excited she gets, even though she says "No!" Her pussy gets soaked with arousal. My dominant personality is a perfect match for her masochistic one!
