The Apocalypse's Little Tagalong

The people eking out a living in the last days are tormented by hardship. Then the Sam people arrive! They come seeking marriage alliances. Eighty percent of the people on their planet are female, and to ensure their species continues, they turn to humans on Earth to reproduce. From then on, people on Earth no longer have to give birth... 1. This is a top/bottom romance with the top as the pursuer. The setting is the author's own invention, and it isn't scientific or logical, so don't scrutinize it. 2. The bottom is intersex. If that's not your thing, don't read! Also, as you can tell from the blurb, this is definitely a story about men having babies. The author just likes making men give birth, so if you're not comfortable with that, don't jump in! O(∩_∩)O~~ Here's a story by a friend that I recommend. Premise: