At War in the Willows (Books 1-3) — Kiki Howell

The Willows is a resort town run by vampires, werewolves and witches. Here, their true identities are kept secret from humans, and intimate relations between the individual clans are strictly forbidden.

Unexpected close encounters, bodies ripe with need, and situations beyond their control lead to forbidden relationships. Now three vampires, a witch, a werewolf and a human must ride along the edges of the rules. They will attempt once unthinkable romantic entanglements despite all those who oppose their relationships, while fighting for their lives as well.

With the Willows full of violence and bloodshed, meetings and magic amiss, will the clans ever be able to find peace among them again? Or, will this war destroy the Willows?

In Book Two, Isaac and Winter devise a plan to try to get the Elders of the clans talking peacefully. But, things don't go as they'd hoped, and the fighting between the clans becomes more devious - deadly.
Now, Devin, another Vampire of Drake's making, steps in to help pick up some of the pieces as his sister, Amberlyn, fights to be with the werewolf, Kane