Sweet Rich Milk summary:

Haruomi, a new farm owner who has inherited the farm from his grandfather, witnesses his employee Akita masturbating while dripping white, sweet liquid. In fact, Akita is a rare bull beastman/milk breed, and he has a constitution that makes it impossible for him to squeeze out the milk that overflows from his chest! In order to save the suffering Akita, Haruomi decides to accompany him in milking!? However, in the midst of all this, Akita's rut ??season has arrived!+