S1's proud slut genius Miru and up-and-coming genius M-man director Sakari have finally collaborated! One day, my sister's boyfriend comes to our house and, although he's incredibly confident, he's not cool at all! To test if he's a man worthy of my sister, I play with his nipples and seduce him, and he trembles and reacts! When I whisper dirty words in his ear, my dick gets hard! It's terrible that he cums when his girlfriend is nearby! But I might want to tease him a little...lol.