Guardians of Glitter Bomb by Maggie Hemlock

Marcel is content with his life as the highest-ranking omega in the Fangs de Sang vampire coven. He has his chosen mate and blood servant, Remy, and his sister, Maribelle, who is also his best friend. He’s spent centuries living a life alternating between defending his family’s legacy and settling in to be a bookworm with Remy. Not to mention they have an adventurous sex life that leaves little time for him to wonder what will happen when his true-mate shows up at their door.

Their world is turned upside down when Marcel catches a whiff of his true-mate’s blood on a battlefield. He and Remy travel across the Atlantic to meet the man who is destined to be their third but fitting into the Glitter Bomb crowd isn’t easy and a bounty on the vampire’s head makes it twice as hard.
Everyone has secrets to keep, but Bruce Moonscale doesn’t consider his own secrets deep or dark. They’re just convenient and allow him to blend into the world he currently inhabits. Some might say he keeps his truth close to his heart, in his very blood. That is what enables his true-mate to catch a whiff of him and track him down from the other side of the globe. With the arrival of the eccentric vampire and his blood servant Bruce might have to let his friends in on his secret to keep his newfound mate safe.

The three of them will have to learn to trust each other and their budding clan if everyone is going to make it out alive.