SDMU-682 A wife-swapping ‘continuous vaginal ejaculation’ battle! The wife… gets 100,000 yen for each time she makes another man’s husband cum inside her in a pile-driving cowgirl position! The husband… is determined not to cum inside her, aiming for the prize money! A total of 16 genuine cumshots as they get incredibly excited watching their partners cheat and have unprotected sex for the first time!