Mailman? More like Breeding Slave. (Demon-King!Katsuki x Izuku)

Izuku Midoriya is offered as a continental mailman, delivering mail between the various human countries and the infamous Demon Kingdom. Very few deliverers make it through to the Royal Family, but what happens when an incubus, Katsuki Bakugou, decides to claim Izuku as his own? Will Izuku be successful in delivering mail to the Royal Family and returning to his home country? Or will Katsuki spell the end for Izuku's human life...? Find out!!
Holy cow, it's been such a long time since I created a new story that I almost forgot to put Disclaimers!!
Disclaimer: I don't own any of the characters, nor do I own the idea of Katsuki being a king, haha.
Warnings: yaoi, mpreg, umm... we'll see what else-

THIS STORY IS NOT BEING UPDATED ON WATTPAD. Because of Wattpad deleting a bunch of my stories, I write on Google (Docs) and post to Archive instead.
You can find the story at the following links:
Google Folder: https://drive.google.com/drive/folders/1wvteMOZcOT9-5pz5jrA2-xMhf2Q7DNZw?usp=drive_link
Archive version: https://archiveofourown.org/works/35812774/chapters/89303719
Google allows commenting similar to Wattpad, and I have little tidbits on my Google Docs that I don't put on Archive :3 You can also see Version History, which is especially useful for the Explanation, which I'm constantly updating....