[It's not even Yukio's arm, but he's kinda nauseated at the idea too. It's Rin, of course, and his regeneration's obviously taken care of it, but... it's Rin.
So instead of being freaked out, he takes the water bottle from Rin and gently takes hold of that arm, checking his brothers hand and fingers to be sure they're in proper working order. It's an unnecessary gesture, he knows, but it make him feel a little better about things.]
Re: action
So instead of being freaked out, he takes the water bottle from Rin and gently takes hold of that arm, checking his brothers hand and fingers to be sure they're in proper working order. It's an unnecessary gesture, he knows, but it make him feel a little better about things.]
It doesn't matter as long as you're okay now.