By giving a different stimulation of pleasure to the body that has been stressed by muscle training, it refines not only the muscles but also the uterus and the beauty of the woman herself. - Keep your position, tighten your vagina, and don't give in to the pleasure! - Even if I feel like I'm about to climax, I'll do my best to endure it! - Win against yourself! - ! - "I feel like I'm going crazy from the ecstasy..."