https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_713720

[Synopsis]

In this world, many women find joy in bearing numerous children, and the quality and quantity of breast milk become a measure of social status.
Monthly breast milk assessments assign grades from Special A to C, with richer flavors earning higher rankings.
A low-IQ, unremarkable man was used as a lackey by Kyoko, the top student in his class.
With her 118cm breasts (over M cup), 22 liters of Special A breast milk per day and fertile constitution (capable of raising 12-15 children),
Kyoko is the girl ''most boys want to impregnate'' yet her terrible personality keeps everyone away.

One day, the protagonist gets hold of a mysterious "sex app" and forcefully seduce Kyoko!
Tempted by her big ass, he fucked her in the classroom, squirting breast milk and thrusting away, then milked her cow-like tits!
Kyoko resisted at first but her body reacted honestly to his cock!
Her breast milk production skyrockets and she becomes pregnant.
After giving birth to 20 children, her bust grows to 130cm and 30 liters of special S-grade milk!

The smartest student in the grade loses out to low-IQ sperm and turns into a Holstein cow!
Through male-dominant breeding training, Kyoko is trained to be a completely submissive mother!

[Heroine Profile]
◎ Kyoko Kitamura

Height: 165cm
Weight: 62kg
Measurements: 118-68-105 (M+ Cup → 130cm)

Milk Production: 22 liters/day (Special A → 30 liters Special S)
Constitution: Optimal for fertility (able to give birth to over 20 children)

[Story]

At first, the heroine is a stubborn delinquent who treats the protagonist like her errand boy but she falls hard for him after he used a sex app on her!
A low-IQ male impregnates and dominates the genius busty girl who ranks first in the class, squirting breast milk and turning her into a Holstein cow!
A must-see for fans of impregnation and breast milk play!
A reversal training story where the protagonist has the upper hand from start to finish!

Base +31, Gitami +16, ADIN0 +10, Porokichin66 +9, Piter993 +9, nuts987 +15, AliceSnow +9

That's a lot of milk every day.

Base +21