Harem Ou no Isekai Press Manyuuki: Saikyou Musou no Ojisan wa Arayuru Shuzoku wo Yome ni Suru

"Turn me into a fat insemination ojisan.'"
"...Eh?"

The protagonist, who asked for such a perverted wish literally right before the goddess, was a man who lived an honest life of solitude. He died alone at the end of his life. Thus, he made a wish: in his next life, he wanted to be surrounded by many kind people who loved him. He wanted to create a big harem. Thus, he was sent to a world of sword and magic.

In this way, he became the mating uncle, Genji, a kindhearted old man with a milf fetish accompanied by the goddess-turned-fat-bird (tsukkomi) Pinoko!

Thus, he weaves the heroic tale of saving the weak, crushing the strong, and turning the women he likes into milfs.

(Source: Kakuyomu, translated)