About Fever: In Heat Why Choose by Thea Masen:
Serina never expected to end up in a harem with two men. But after being sprayed by a mysterious chemical on her last mission, she’s now producing potent pheromones that have started to drive the crew wild with lust. The effects are strongest on Rah and Kelon, two Mahara men who will die if they don’t get what their bodies need–her.
To protect the crew, the ship’s doctor forces the three of them into isolation and Serina soon finds herself in an unexpected love triangle with two hot aliens. One of them wants to keep her for himself. The other wants to share and form a long-term harem. Will they learn to work together during Serina’s heat, or will Serina need to choose between them?
If you love why choose, induced mating heats, and aliens with useful anatomy, you’ll love Fever.