He doesn't react outwardly to the older girl's startled half-jump at his appearance. But inwardly, he reminds himself to try and... attempt to give her and Minato forewarning before appearing if its keep catching them by surprise.

"Yes, I did," Pharo bobs his head of faded black hair in answer to the question she asked him. Absolutely no shame about that to be found here, but he frowns and tilts his head slightly at the rest of her words. "... Why not?"

Minako did actually have a pretty grasp on his mental level of intelligence; clearly above that of a mere childs' but far below that of an mature adults' as well. At this stage, the ability to recognize the expectation for him to conform at least a little to some social norms is possible, but it's certainly not his first reaction apply it to anything he personally does, very often, really.