Narovian Mates (Narovian Series) (English Edition)

Not all Narovians are feline humanoids. Some are homo sapiens, but only the feline humanoids can recognize their true mates. The Narovian felines have been visiting Earth for centuries to monitor and protect the technologically inferior civilization from aliens who would plunder their world. By the 21st century growing numbers of Earthers carry feline genetic markers in turn, Narovian felines are finding their genetic mates among the backward Earthers.

When they find them an exchange of pheromones cause them such heightened sexual desire they must mate almost immediately until they're bonded emotionally as well.