"Nor am I," he says with a laugh. "Lord, if you two hadn't played that trick, where would I be now, eh?" He smiles at Watson, warm and playful, and points an accusing finger. "My wife might just have carried on being infatuated with you, you heartbreaker, and I would've kept stumbling along, telling myself a wife'll drop out of the sky when the time comes for it."

He doesn't hold any real jealousy, and he and Mary tease each other about it occasionally.