[Koyama Shigeru] Raised as Livestock (2D Comic Magazine Kikaikan Ningen Bokujou Vol. 1)

A dark science-fiction fantasy unfolds as a ponytailed schoolgirl awakens to discover her voluptuous body bound by strange milking machines, her memory fuzzy after a rural farm field trip. She and her classmates are gradually broken in by a lecherous farmhand, who uses mechanical pumps to harvest their breast milk, restraint devices to enforce compliance, and his own cock to ensure they are fully 'well-conditioned livestock' from every hole. The story crescendos into utter surrender, with the once-confused girls now eagerly begging for more food, more cream, and more usage of their holes as a trainer smirks that he knew they'd adapt to their new lives as breedable, milk-producing cattle.