Instead of a seedless husband... His son's wife seeks his stepfather's sperm over and over again until he gets pregnant

Mio has been loved for many years in the economics seminar of university professor Sugiura. With the guidance of Sugiura, he rose to become an associate professor. At that moment, Sugiura's wife passed away and at the funeral he met his son Yuji and married him. He is currently taking a leave of absence from university to try to get pregnant. She is working hard to get pregnant, but there are no signs of it, so when she takes her husband's sperm for a test, she discovers that she has azoosperm. At that moment, Sugiura, my admired mentor and father-in-law, crossed my mind. His physical relationship with Sugiura, which he had fantasized over and over again, and his unfair fantasies, are now in reality.