He wants to have sex with his sister, but it's not allowed. He arranges a time for her to be with her male friend instead of him, and when his brother goes out for some urgent business, he forces them to be alone. Then, suddenly, he gets flirted with by his brother's friend! Although he's shaken, he doesn't seem to mind the skinship of the young boy, and even though he says "no," he lets out a sweet sigh... When he kisses her and fondles her breasts, he moans lewdly.