[ He can absolutely tell which one it is without even trying. He's not a genius at it, and could probably suspect after a bit of conversation since he talks to Hikaru way more and he's pretty sure that they look at him differently. But the fact that he uses a suffix at all when he and Hikaru don't bother is a dead giveaway.
He blinks in surprise regardless. He's not disappointed (he still likes Kaoru and is happy to see him!) but there's definitely a weird pit in his stomach of hope that his twin is here too. ]
Kaoru-san!
[ Guess who clearly wasn't paying attention to who he was bombarding with snow... He stops and comes over to him, slowing down because his familiar is... whoa... ]
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He blinks in surprise regardless. He's not disappointed (he still likes Kaoru and is happy to see him!) but there's definitely a weird pit in his stomach of hope that his twin is here too. ]
Kaoru-san!
[ Guess who clearly wasn't paying attention to who he was bombarding with snow... He stops and comes over to him, slowing down because his familiar is... whoa... ]
That's your familiar?! BADASS!