Ryu heard Yuuki snoring from inside, then blinked curiously. Sleeping in the bathtub is dangerous, after all.  He took a deep breath, opening the bathroom door to peek in at his sister.  He went to a full blush as he noted she was naked, and mentally berated himself for not assuming that... yes, in a bathtub, people tend to be without clothing.  He swallowed his insecurity about that, watching her to make sure she had no danger of slipping below water level.<br/><br/>Of course, he kept watching her for a while after that... he heard his sister come home and fumble around in her room, but he could always use the cover story of making sure Yuuki wasn't drowning.  He didn't know what it was, but he couldn't pull his eyes away from the sight in the bathroom...