
Yeah, I suspected as much. Though it would be really nice if the oldest of the (err....nanao's family surname, sorry, forgot), was a guy, but I can still ship the oldest sis and the oldest brother, since she seems kind of sadistic, it would be funny.
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But, do you know if there is already a story yuu x oldest bro?

I meant Nao's brother, not Nanao's sister.
Anyway, here you go. It's unclear when/if there will be more.
http://sakurayuki523.tumblr.com/post/130552834733/warui-series-hisa-nii-one-shot
I really want a romance for the oldest brother. Not just because he is cute, but also because it would be just so completely adorable to see Kuon and Tora(? Sorry, forgot his name) bro-con for the eldest. I mean, we all know how much he loves the two of them, so now it's their turn to show their love for the oldest
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I can't be the only one who wants that