I would LOVE for this to happen! Yata would be a fun yet reliable older brother to him (who totally kicked his butt at DDR, nyeh). I looked Mao up and it says he's seemingly blunt and unsociable, but suprisingly friendly and attentive? And that's Yata too! Only maybe not so responsible and... smart... Yata's a PUNK but he wouldn't show too much of that side to Mao, of course.

Anyway, I think this could work out too! Yata (or Misaki since they'll be sharing that last name?) will support his brother's dreams of becoming a lawyer! Or an idol. Whatever he wants to be!!!

Also I can't believe Mao is taller than him by a centimeter.