Jade Bleu 
Alien Inside Her #1: Justine [EPUB ebook] 

Strapped down and claimed by a multi-limbed alien!
The alien visitors offered a miracle serum that the government tested out on Justine. One sip and she was writhing and ready to be taken and ravished by the alien whose slithering appendages offered her more pleasure than she can handle, both front door and back.
An erotic alien takeover story featuring a hungry, multi-limbed alien, DP, surprise anal, and a salty hosing.