"What we did together is our secret...?" My brother and Ayu's brother are a married couple who can't have children. One day, I ended up having creampie sex with my sister-in-law Ayu. After that, my sister-in-law started seducing me at every opportunity in the house, taking showers with me, giving me a blowjob next to my brother while he was sleeping, and showing me her sex with him... And today, I had creampie sex with my sister again...