Tsubasa hasn't been married for a long time, probably because she married her husband who is a year away, or because of her husband's erection. At that time, my brother-in-law came to Tokyo and decided to stay for several days. His brother-in-law, who looks down on the charm of Tsubasa who has not met since the wedding, accidentally witnesses Tsubasa's masturbation. If you can't stand it and approach it, you will accept the unsatisfied body. After that, they devour each other's lusts to respond to their brother-in-law's unequaledness.