When Harvey murmurs 'good boy' approvingly, it disturbs Mike just how…petted he feels; how much he wants to hear it again; what he'll do to get those two words in that order out of Harvey's mouth.
(Working for eighteen hours without a break is going too far, but he was on a roll and even if Harvey had lost his voice, Mike would've kept digging.)
So yeah, disturbing.
But not half as much as his reaction to a terse, uncompromising, "You screwed up. Bad boy," with Harvey's eyes flint-hard then speculative, amused.
He really wants to hear that again.