After finishing his part-time job late at night, Sang-Yeo walk Si-Eun back to her apartment. As a thank-you, Si-Eun invited Sang-Yeo to have a drink at her apartment, and while drunk, Si-Eun began asking Sang-Yeo by saying, “Do you want to prove whether I’m a virgin or not?”
[NON-CONSECUTIVE] Jinhee tries to get off by masturbating alone in the bathroom but it's not enough. She accidentally goes into her Sangyeo's room thinking it's hers, only to find her brother's rock-hard dick towering above anything. At that moment, boundaries became meaningless, as she let go of reason & started acting according to her instinct, full of repressed lust that has been neglected for very long time. She finally gets off after using her sleeping virgin brother to her heart's content.