Explanation (PLEASE READ [even if you've read He's Mine!]!!!!!)

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-