น้องสาวไม่แท้อยากซ่อนเกรดแย่ ๆ ของเธอจากพ่อแม่

I found all the failed tests my stepsister was trying to hide under the mattress, and I had to use it to my advantage. She told me she'd do anything to keep it a secret, but all I wanted was that pussy and throat.