Ask my younger brother to help my wife conceive Tsubasa Amami.

A really crazy idea, but he had no other choice after seeking help everywhere and still not being able to have children. It had been 5 years since they got married, but Tsubasa couldn't bear children due to her husband's physiological issues; she hadn't even reached orgasm once. That was truly a disadvantage and misfortune for her, a woman with desires who constantly craved intimacy. Her impotent husband had to ask for help from his younger brother, a strong guy good at sex, to help his wife conceive. Tsubasa felt resentful toward her husband, not because he was doing something incestuous, but because he hadn't brought his brother to meet her sooner.