Karen Mifune and her husband have been married for a long time but still have not given birth to a baby. The couple decided to take each other to the doctor.
The doctor diagnosed that the husband was infertile, and the wife had weak ovulation. That is the reason that both husband and wife cannot have children.
The new doctor suggested to stimulate the wife's eggs, so that the vagina could be filled with sex. Karen Mifune would have made it easier to conceive because of that, but her husband didn't know how to do those erotic jobs.
At the mercy of the old doctor again, he had to help enthusiastically. The doctor stimulated Karen Mifune to ovulate. And then the doctor also inseminated Karen Mifune.
Cuckold sex movie genre, husband watching his wife get fucked by the doctor lol.