Alien Mine by Marie Dry
In a bleak future where government systems are breaking down and lawless bands of men terrorize the country, botanist Natalie Hanson fears for her life and hides in a cave in the Rocky Mountains. When she is captured by human raiders, a fierce alien appears and slays her attackers. Natalie is now held captive in her own cave by the sexy and striking alien commander, Zacar, who informs her that she will be his breeder. Natalie soon realizes that these aliens worship strength. So what will happen when Zacar finds out she has severe asthma?