With a shared love for baking and an empty house, Ryo-sensei and her younger brother log onto Skype, planning to discuss their favorite cookie recipes. But as they start chatting, the innocent conversation takes a sultry turn. Ryo-sensei, her voice soft and seductive, starts describing her favorite cookie ingredients in explicit detail, making her brother blush. He tentatively responds, his voice thick with desire, and soon they're both breathless, their Skype chat echoing with moans as they pleasure themselves, their cookie baking session forgotten.