As A Mule. Seven Brothers, #6

Jack is prickly on his best days and an asshole on the worst ones. He loves that his brothers are finding their mates and have happy lives, but that's not for him. Who could stand to spend more than a few minutes with him apart from his family? Besides, he doesn't need anyone. He's not like his brothers, and he's fine on his own. Nothing and no one will change his mind about that. Blair has a successful life, except for one thing-his love life.
He's used to people taking advantage of him for gifts, money, or connections, and he doesn't expect anything different. Until he meets his mate. Jack and Blair are too different, and Jack knows it. He doesn't understand why Blair can't see it, no matter how hard he pushes Blair away. He also has trouble staying away, and when Blair invites him to a fundraising party, he can't say no. Can two such very different people work together? Or, as Jack fears, are they destined to grow apart if they attempt to have a relationship?