9S balks and recoils at the idea of using his tongue to hack.

"What?! No! Why would I-! No." Gross?! "I don't need any sort of external attachment like that. I hack wirelessly."

So really, he doesn't actually need Rhys permission. Or cooperation. But for his own sake, he'd much rather do it with permission than not; it would feel kind of weird and dirty if he didn't.

That, and he's not entirely sure he can hack Rhys without his permission. Does his own programming disallow him to hack a human the same way he's unable to raise a hand against them? A troubling thought.