I abandoned my pregnant wives in another world.

The main character at the age of 15 was transported to another world. When the King of the other world asked for his name, the main character calmly introduced himself as Ass Fucker. After that, the hero slowly built up his harem, defeated monsters, and eventually became the strongest hero in that fantasy world. His final battle with the Demon King arrived, whom he easily defeated. Ass wanted to celebrate his victory peacefully in bed with his wives, but they suddenly informed him that each of them was pregnant. Of course, Ass immediately decided to return to his own world, but that wasn't the end of it. His wives found a way to move to his world and they returned with children of his age to take revenge on him? Seriously?