I made my cheeky big-boobed sister, who makes fun of me, wear obscene cosplay to make her understand! One day, when I was getting horny with my sister who was defenseless and showing off her cleavage, she looked down on me and said, "If you get 100 points on the next test, I'll do whatever you say (lol) It's impossible anyway!" My anger and sexual desire exploded, and I studied hard for a miracle! And the result was, "See! I got a perfect score! Please listen to my request," I forced my confused sister to wear obscene cosplay and turned the tables on her, making her a submissive pet! I played with her G-cup breasts as I pleased, making her cum with shame!