I wanted to describe a CYOA idea similar to impregnator kings I had been toying with doing for pregchan for awhile, in hopes someone else may be interested in taking up the idea since I don't have time to commit to writing it myself
The Premise is that you are effectively a fertility based demi-god that gains power by impregnating people, tasked with defeating the infertility plague affecting the world.
I already have a decent cosmology for the gods I wont bore you with now, the important part is when Mother Ert (the god that effectively invented sex and pregnancy) had expanded almost all of her power she was raped by another god and insisted on keeping the child despite the risk of the pregnancy using up all her remaining strength and killing her. Her daughters offered to take turns carrying the child to prevent the strain from killing her mother, but when one daughter finally gave birth she was so disgusted by the child she left it to be cared for by a wolf and told her mother it had died during childbirth. This god becomes effectively the worlds version of Satan, seeking revenge for being abandoned. With the help of it's father it created and spread an infertility plague that made pregnancy's harder to achieve and was causing population to slowly decrease over the generations as birth rates failed to keep up with deaths.
Your father is the king of one of the most prosperous city-states remaining, and one of the few that still worshiped mother Ert despite her apparent disappearance from the world (she still is recovering from the pregnancy, and that isn't helped from the lost belief caused by the infertility plague). He went on a journey with his wife to find Ert when it looked like his wife would die before giving birth, and Ert helped them by gifting unborn you with a fraction of her power so you would survive until birth. In doing so you have been made something of a demi-god yourself, with a gift for fertility. You don't learn that until coming of age (the start of the adventure) when you are sent to find Mother Ert temple again and she explains that with your power you need to find the creator of the infertility plague and fix the problem, but first you have to journey to hunt down all the lesser gods and ask for their blessing to grow in strength.
The main idea of all this was to create a CYOA where pregnancy is a key part of the adventure, not an aside that happens to occur during the adventure. You gain Post too long. Click here to view the full text.