My Friend's Big Sister's Got a Big Punishment for Me!

Takeru goes over to his friend Hiro's house for a playdate, but Hiro's voluptuous older sister Natsumi comes to the door instead. It turns out Takeru's friend has already gone out onto the town, but Natsumi takes pity on the young boy and convinces him to stay over. When she notices Takeru sneaking a peek at her underwear, she has no choice but to teach him that actions have consequences!