Nangoku Sakunyuu Island ~Ninshin Sasete!? Chichi Shibori~

The main character drifts ashore to the island, where only girls with big breasts live. He is welcomed by them, and starts to live with them. One day, a man, whose job is to milk the girls, has gone missing. The girls need him because they make a living by selling their breast milk. As a result, the main character is forced to take over the job. He has a good cause to ejaculate inside the girls... on business? Anyway, his sex life soaked in milk starts....