Monster Married by Alexa Piper

Two years into the apocalypse, Rory got lucky. He found a monster that’s out to love him rather than eat him. Even better, horned and handsome Inkiri comes with a found family he’s only too happy to share with Rory.
Rory knows he can make that work for him—if it weren’t for his magic, magic he doesn’t understand, much less want. To save Inkiri and his new family, Rory helps bring them to another world where he hopes to find safety. He hopes he can make it so he never has to use his magic ever again.
But where magic is involved, things are rarely that easy.

Monster Married continues the story of Horns & Heart and should be read in order.