Nigel knows it's wrong. He sees the young rabbit shifter that his young nephew has been seeing romantically since they were both children and knows that Ari is not meant to be his.
He can't help it. She is always there, looking so perfect in her cute little sundress, so comfortable in his presence that she does not try to hide the rabbit ears from him. His wolf sees the prey shifter and wants to lick up her neck and bite her neck with his fangs, leave his mark on her and make her his own.
He loves his nephew. He won't do anything to hurt him. But she's eighteen now and is sending all the right – wrong – signals. If she wants him too, perhaps his nephew and him could learn to share.