They have such a fantastic relationship and it develops so logically and perfectly (minus one or two misuses of plot points.) This is why the slash shippers annoy me so much, stop ignoring possibly one of the best romances on TV in forever.
Bradley James, you are ridiculously attractive and noble and hysterical and strong and wise and loving and endearingly annoying. You and Angel Coulby have some serious chemistry. I& kinda in love with your character, Arthur.