*killua freezes up as gon's fingers grace his ear, the thin membrane quivering at his touch. he hopes the rest of his new organs aren't just as sensitive, or he'll be in trouble when gon inevitably gets his hands on them. pulling away, he kicks his tail and leans back in the water with it out in front of him, crossing his arms with a huff.*

i guess you'll have to...

*he watches warily as gon splashes into the water, remembering how good he is at swimming from their harrowing time in the beach room. he shouldn't have any trouble navigating the tank, mermaid or not. the flash of gon's skin he sees beneath his billowing shirt causes him to blush lightly, before he remembers that he himself is completely naked and lets his tail sink back behind him, suddenly modest.*