Jade Bleu 
Fertile for Aliens #1: Chance [EPUB ebook] 

Taken hard and fertile to give heirs to a multi-limbed alien prince!
Chance was one of the chosen earth women to be offered to the visitors for mating. She was still undergoing tests when a large alien burst in to take her fertility rough right by the treadmill…extra appendages and all.
An erotic alien takeover story featuring fertile fun with a hungry, multi-limbed alien and DP with surprise rear entry.