"You don't get to boss me around," Derek growled. "And I'm tired of you thinking that Isaac somehow negates your existence. I had Isaac before I ever laid eyes on you--although I should thank you for making me appreciate a loyal, obedient slave by your negative example. I might have continued taking him for granted if you hadn't shown me how difficult my life could be--and has been, ever since."
But that didn't matter to Derek. He'd believed that Stiles was worth the aggravation, worth the frustration. Perhaps he'd been wrong.