Jade Bleu 
Invaded by Aliens: Susan (Alien Forces, #2) [EPUB ebook] 

Probed by aliens until I loved it!
 When the alien species gave a group of women a chance to run away from their long, groping appendages, I thought my track star background meant I was safe. Little did I know that they were seeking the fittest females to tolerate the relentless urges of three large, horny aliens. Winning the race earned me a trip to the mother ship, where I was restrained, sprayed down with some sort of warm cream, and probed by all sorts of bizarre anatomy in zero-g until I had been fully used and couldn’t move a muscle.
An erotic alien takeover story featuring probing, hot humanoids with large appendages, and characters 18 years and older.