Alien Resistance by Amanda Close
In the aftermath of World War III a reptilian army emerges from the darkness of space to launch a ruthless campaign of conquest and genocide. All that remains of the world is a wasteland of concrete ruins and shattered architecture, now the dystopian battlefield upon which the human resistance wages its defiant war of survival against the invaders.
After being defeated in a violent firefight Tara, a young resistance fighter, must endure the carnal appetites of her captor and his warriors. While she struggles with her own forbidden desires she must find a way to strike back, or else become the trophy of an alien warlord.