[A live-action version of the smash hit with over 240,000 downloads!] Akari and Mark are left alone to look after each other while their parents go on a trip. While the caring Akari is washing Mark's back in the bath, she sees his erect penis. Mark is embarrassed to be seen and gets angry, saying, "Show me your big sister's boobs, we'll be even!" Akari readily agrees, leaving him confused. However, when Mark sees Akari's big boobs, he can't help himself and jumps on her, saying, "You want to be spoiled... you know, you haven't had your mom for so long..." Akari finds Mark endearing and decides to help him have his first orgasm...