Watcher United by JL Madore

The Egyptian twins.
Seth was one half of something great. He and Phoenix were unshakeable–unbreakable.
But when the foundation of that life crumbles, Seth is forced to reevaluate everything he thought he knew about: relationships, values, self-image, and scariest of all . . . love.
With all eyes on the hulking warrior to step up, Seth must prove that his mighty strength isn’t only physical.