The Pervert's Comeuppance (Femdom, Chastity)

Sara is annoyed to discover herself being violated during the night, but instead of confronting the perpetrator directly she decides to gather evidence and use it against him. She no longer has to be worried about being disturbed in her sleep, as the culprit is forced to wear a chastity cage for her. He has no choice, because otherwise she will reveal that he's a pervert to the rest of the family.