Koumi-jima: Shuu 7 de Umeru Mesu-tachi - Episode 1

Seiichi Ozaki, a high school teacher with a massive cock and insatiable libido, is sent to Koumijima island at the village chief's request to breed the island's hypersexual, genetically unique females. The women there have been selectively bred over generations to be consummate females, with outstanding breasts and hips, but their genetic line has reached its limit and can't reproduce. Seiichi stays with Kaori and her daughters Konomi and Riana. He gets to know Konomi, who shows off her huge breasts and thick lower body, begging him to touch her. Seiichi ends up fucking Konomi in her futon, filling her with cum as she begs him to make her pregnant. Later, he has sex with her again in the bath, and Konomi claims she might be pregnant. Riana catches them, but she's more mainland-oriented. Then Kaori herself begs Seiichi to fuck her after watching them, claiming she's still a breedable female.