The siblings huddle together, their hearts pounding like drums in the tiny space. Michelle's fingers trace the outline of her brother's cock through his pants, feeling it twitch and grow. "We shouldn't," he whispers, but his body betrays him, lubricating the shaft as Michelle guides it into her waiting, untouched pussy. She sinks down, her tight walls stretching to accommodate him, their bodies slick with sweat and guilt as they chase their taboo pleasure.