Kyonyuu Fantasy 3

The protagonist is Yurinas, the god of Boobjobs that lives in the underworld. However since nobody builds effigies of him, his rank is low. He wishes to heighten that rank and become intimate with the goddess Athena who is famous for her huge bust but things aren't so simple. One day while enjoying some sword play like always with his friend Faron, the god of Death. He pokes a strange protuberance on a rock and gets sent to the human world.

(Source: VNDB)