Until recently I was writing a CYOA story on preg-chan called Impregnator Kings.
The story revolves entirely around impregnator/pregnancy/birth fetishism.
The story stars Sir Edward of Virilia who lives in a medieval (ish) setting that is not Earth as we know it, but has some similarities. His father is an Independent Duke, who bows to no King. Edward is his eldest son and stands to inherit his father's Dukedom, but he is more ambitious. He wants to be a King.
Also, he has already fathered dozens of childrens by having lots of sex with every woman in the castle, because he loves to see them pregnant.
This has given him a reputation as a man who is a reliable source of sperm for countries facing succession crises. Even though he's of lower standing, many royals want Edward to marry into their families.
The game begun with Edward meeting a matchmaker who showed him a bride to choose from. He had the following options:
1. The Tomboy Princess Alena of Saintheim. Princess of a large, stable country, but Alena herself is reckless and rebellious. If Edward married her, he'd have a stable political life, but he'd have to persuade Alena to become a good mother, or at least sit still long enough to give birth.Post too long. Click here to view the full text.