In the quiet, dimly lit room, Khmer siblings steal glances at each other, their eyes filled with curiosity and longing. The older sister, her heart pounding, tentatively reaches out to touch her brother's arm. He shudders, his breath hitching as her fingers trail down to his wrist. They pause, caught in a moment of hesitation, before the sister's hand moves lower, tracing the growing bulge in his pants. He swallows hard, his eyes never leaving hers as she unzips his jeans, revealing his throbbing erection. She tentatively touches it, her fingers wrapping around his shaft as he lets out a low moan.