General by Charity Parkerson

Ajax’s life belongs to the Royal Guard. Being his prince’s personal bodyguard is his greatest honor. What is he supposed to do with Lucas?
There are very few select people—still alive, anyhow—who know Prince Noir runs Atlantic City. Lucas used to be proud as hell for being one of those people, and then it almost got him killed. Now he’s trapped, recovering in the prince’s home. Everything about the situation has him frustrated beyond words. The only thing saving him from disappearing is Noir’s sexy general. He isn’t sure that’s enough.
It isn’t in Ajax’s DNA to feel remorse or pity. Unfortunately, being involved in something that almost killed Lucas has him feeling things. Despite the age gap between them, Ajax has thought of Lucas as his best friend since not long after they met. Lucas is funny, wicked, and caustic. Everything Ajax loves. Now he has a bad feeling Lucas plans to take his smiles and run. He can’t let that happen. If he does, Ajax will be the one who has to kill him.