A keyblade to the face would be a quick way to put a damper on their friendship, that's for sure. Besides, now that he has the tattoo it's not exactly going to be easy to get rid of it. Once it turns around to bite him on the ass as it inevitably will, he'll understand what she meant about Darkness being a terrible idea.

He's fine, look, no problems here! Just a few extra pairs of hands.

"Yeah! Exactly. Everyone always says they need more than two hands, right? Well now I got 'em." And they conveniently tuck out of the way when he doesn't need them anymore.