Under the cloak of night, the siblings indulge in their primal craving, their bodies slick with leche. The sister's fingers dance along her brother's length, coaxing forth more of their shared essence. He responds in kind, his touch igniting her core, drawing forth her own leche. Their bodies undulate, a wild, untamed rhythm, as they give in to the primitive pull of their bond, their voices raised in a silent, ecstatic chorus.