Ten years ago when she married her husband, not only did she become his wife but also became the mother of his young son, Iroha. She was worried about how well she could handle being both a stepmother and a mother at such a young age, but they lived together harmoniously. However, their marriage had been sexless for many years, leaving them both sexually frustrated. One day, her husband brought home a balance ball. He invited their son to play with him using the balance ball, and during their exercise session, their son became aroused. Their son started rubbing Iroha's ass. At first, Iroha resisted and tried to escape, but her son pinned her down...*The recording contents may vary depending on the distribution method.