[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.
Gangchan wants to learn some workout exercises from Seyoung but that takes a weird direction. She then pounces on him while he was still asleep. Gangchan wakes up to Seyoung being on top of him, and then SHE FUCKS THE SHIT OUTTA HIM.