Narrowing his eyes, he huffs and mumbles, "Hope so." Because he likes the idea of it all. Sherrinford is fairly mild mannered. He gets flustered easily and can be quiet, obedient and loyal. Maybe he needs to rile him up to anger. An angry Sherrinford might be the best thing ever.
He watches Sherrinford but his eyes shift down to the fingers on his tie. Jim is only staying quiet because he wants to see what happens next and he's a little bit excited.