Jade Bleu 
Invaded by Aliens: Rachel (Alien Forces, #1) [EPUB ebook] 

When the aliens took me and hosed me down with salty white cream, I was terrified to think of what they would do with those long, groping appendages. Then 
he came in, the one with human as well as alien features, to probe me hard along with two more males just like him. Without the benefit of gravity, we went three-on-one where every orifice was stuffed with stinging tongues, tentacles, and pronged man parts in the wildest, most out-of-this-world sex I could ever have imagined. Now, all I want is more.
An erotic alien takeover story featuring anal invasion, multiple penetration, and pain play.