The Jester Prince (The King Jester Trilogy Book 2) by V.M Forrester

With Zirkua Fantastic destroyed, King Jester, the embodiment of discord, is loose once more upon the world. And he's not happy to have been kept in captivity all these years. Only Toby, a fresh, untrained immortal, and the other former members of the traveling circus now stand against him. Now, with Toby's boyfriend, Markley, kidnapped by King Jester, they have no choice but to leave the safety of their camp and venture into the world at large. King Jester grows more powerful with each passing day, and each moment Marley stays in his clutches is another moment closer to absolute destruction. Toby will get Marley back. Even if it means facing King Jester alone.

The Harlequin Circus (The King Jester Trilogy Book 1) by V.M. Forrester

Tobias has never known anything but the silver and crimson silks of Zirkua Fantastic. Raised from birth alongside firebreathers and hawkers and tightrope walkers, now he performs at the myriad stops of the traveling circus. Setting up every evening, and never staying past the sunrise. That is the way of Zirkua Fantastic. When a newcomer arrives to join the circus, the first domino falls. There's always been a subtle undercurrent of magic in the circus, inexplicable coincidences and rituals of protection. But now, the full force of the magic has burst to the surface, and a mysterious, powerful entity has broken free from her prison, intent on burning the circus to the ground. Now the circus hangs in the balance, and if the magical bonds break, the consequences will be devastating.