The cutest little sister he's proud of is actually a call girl!? She was supposed to punish her brother with his dick, but... "Today, be my practice dummy! In return, I'll make you feel good!" "You're the worst, big brother! This kind of thing can't happen between brother and sister! Angry!" Nanami is a devilish little sister with a strong Kokoro of curiosity. Yui is a small-breasted, shaved little sister who's good at making excuses. Two forbidden brother-sister pairs are included!