Ryouta's sudden realization startles Sora a little. He's pretty sure that outburst means he's connected the dots here, but it surprises him because he wasn't expecting him to be able to tell just from what was said alone. Of course, he's completely forgetting there are also the presents and his blush to add to the equation, too.

"Gah, Ryouta! You don't... have to yell. It's not a-- Okay, it is kind of a big deal, but if you just found out what I think you just found out, well we're not really telling everyone yet, so... Not so loud?"