Once upon a time, there was a nanny and a gardener. They were inexplicably close, but liked to dance around each other. Warlock didn't really understand their relationship, but he didn't concern himself too much with the affairs of grown-ups, especially not when there were stories to hear, butterflies to chase, and anthills to conquer! TL;DR: While Crowley and Aziraphale try to raise Warlock they fail miserably at hiding their relationship (it's almost like they're not even trying)