Dark Allure by Imogen Sera

Eve was just trying to be a responsible house sitter. She didn’t want to slip and fall into the sea, and she certainly didn’t want to wake up in a terrifying purple guy’s bed and immediately be accused of being a witch. It doesn’t help matters that this particular terrifying purple guy is the Demon Lord Az’ralon, or that she can’t help but want to touch him constantly. She just wants to get home, but as time passes, that seems less and less likely.
When the Demon Lord of Poremi discovers a woman has been dumped in his territory, he is suspicious. She’s the first human to cross the portal between the lands for centuries, and her innocent act combined with his unbridled attraction aren’t particularly convincing that she is who she says. Giving in to his impulses only serves to convince him that she’s much, much more dangerous than he’d feared…