It's pretty obvious, right, onee-chan? All you have to do is look at our faces!

[ You two look noTHING ALIKE.. if anything, people might believe that Shuu really is Natalia's sibling more easily than him being Kaoru's grandfather. Or.. anything at all related to Kaoru..

Granted, it's since they're not actually related, but it's easier (and oddly more comfortable, don't question Shuu's desperate ways) to claim it's this way. ]

Kaoru's from the faaaar away future! I'm already six feet under by the time Kaoru's around! [ HE SAYS IT SO CHEERFULLY. ]