Yuu's hubby doesn't have strong enough sperms to make her pregnant, so this fake fertility specialist Michel Tanaka helps her by donating his own sperms into her vagina using his penis. It's natural mating between two humans but this is extramarital sex, so the baby they make will be a bastard child. Michel's hard penis gave Yuu a lot of pain and pleasure. He stained Yuu's vagina with his white semen. His semen contained healthy sperms that could penetrate Yuu's egg.