Blitzen's Fated Mate by R.E. Butler

I had heard about this book on the Smart Bitches Trashy books website. They gave it an F+ for just pure nutsiness and I loved the review. 
Honestly, I don't think Elyse's review can be beat so the TL;DR is that the shifter in the "Blitzen position" falls out of the sky and meets his fated mate who he more or less immediately starts boning.

Two and a half stars

Followed by Dasher's Fated Mate

This book came out February 29th, 2016

Kindle book

Opinions are my own