My step-sister, born from my parents' remarriage, is a super slutty devilish schoolgirl! She offered my unpopular virgin masturbation brother a devilish contract: "If you can hold off on ejaculating for a week, I'll let you have sex with me! But if you ejaculate, you'll be obedient for the rest of your life." After that, my step-sister, who was always aiming for my dick, gave me a handjob, a blowjob, and a final intercrural sex attack. The moment the time was up, my step-sister immediately inserted her pussy from behind! My step-sister, who was overwhelmed by the pleasure of my huge cock, became an obedient pussy in a big reversal!