The siblings huddle together in the cramped space, their bodies pressed close for warmth, but the heat between them is anything but innocent. Choi's breath hitches as her brother's hand brushes against her breast, his touch igniting a fire within her. She can feel his hardness against her thigh, and the knowledge that she's the cause of his arousal sends a thrill through her. Their kisses become more urgent, their hands more exploratory, as they succumb to their forbidden desires, their bodies moving in sync, lost in the intensity of their first time.