A couple exchange 'continuous vaginal ejaculation' battle! Wife...If she makes her husband cum inside of her with a staking cowgirl position, she gets 100,000 yen per shot! Husband... "I'm not going to cum inside" and hold ejaculation for the prize money! The first time she saw her partner's live sex with her partner, she was so excited that she got a total of 16 genuine Nakadashi shots!