Mifuka's husband still has a strong sex drive and they were intimate tonight. However, lately, he hasn't been able to fully satisfy himself after just one round, leaving him frustrated. To relieve his urges, he decides to exercise. He confides in his son, who offers him a balance ball. That day, while exercising with the balance ball, Mifuka's legs cramp up. Her son notices and helps her stretch. As he assists his mother, he starts to feel aroused. Mifuka, touched by her son, begins to feel strange sensations. After the stretching, her body feels hot and the feeling won't subside. Mifuka starts masturbating in secret. However, her son catches her in the act...
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