Mistu, the younger sister, has always been the apple of her brother's eye, but their bond takes a dark turn when she walks in on him masturbating in the bathroom. Instead of the expected embarrassment, she feels a jolt of arousal at the sight of his thick, veined cock in his hand. She can't help but imagine what it would feel like inside her, and the thought sends a wave of heat between her legs. Their eyes meet in the mirror, and the unspoken understanding passes between them. They're playing with fire, but the temptation is too great to resist.