That's because I'm an older sister!

Eavesdropping is frowned upon, y'know.

With you acting surprised, already knowing that we prepared some, you're the last person I want to hear that from.

But still, how did you know that Koishi wanted to do a Valentines?

Well, I am an older sister after all.

Perhaps Koishi would actually like you if you'd acted nice in the first place.

Wow, she's annoying.

Psh...