Moon Spell by Christina Lee

Werewolves only exist in fairy tales…at least that’s what most townspeople in Lunar’s Reach believe. Unless you’re a powerful healer who concocts a potion to help a fledgling shifter remain human during the full moon.
It works to Bellamy’s benefit, since he’s been in hiding at Moon Flower from Ashwood, his beloved, who betrayed him two years before. But now that violet fever is sweeping through Etria and Bellamy has fallen deathly ill, not even the Madam from the apothecary can heal him.
Ashwood believes only he—his fated mate—can save Bellamy from the sickness. Unfortunately, he’s right. But Bellamy cannot bear being in his presence, nor suppress the longing he still feels for the man. Despite their history, Ashwood still owns his heart, and soon it becomes clear that someone from their past presents a danger to them both.
Perhaps Bellamy could use Ashwood to exact his own revenge before dooming him to eternal loneliness without his mate. Except, that plan would require allowing Ashwood to touch him again, and Bellamy isn’t certain he could resist being cast under his spell. Not when Ashwood feels so perfect—and so right.

TW: Discussions and depictions of assault, as well as a background representation that some might find unconventional.