A Cursed Kiss (Myths of Airren #1)

Living on an island plagued by magic and mythical monsters isn't a fairy tale... it's a nightmare.
After Keelynn witnesses her sister's murder at the hands of the legendary Gancanagh, an immortal creature who seduces women and kills them with a cursed kiss, she realizes there's nothing she wouldn't do to get her back. With the help of a vengeful witch, she's given everything she needs to resurrect the person she loves most.
But first, she must slay the Gancanagh.
Tadhg, a devilishly handsome half-fae who has no patience for high society-or propriety-would rather spend his time in the company of loose women and dark creatures than help a human kill one of his own.
That is until Keelynn makes him an offer he can't refuse.
Together, they embark on a cross-country curse-breaking mission that promises life but ends in death.

Fantasia