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There's one piece of cookie left

There are two of them

Changmin easily caught how her eyes focused solely on that one piece of chewy chocolate chip fudge cookie.

But he was faster

His arms were longer, which means he can reach farther

And so before Sooyoung could lift her hand, his own darted forward and grabbed the cookie.

She stared in disbelief as he held it; her hopes rising when he split the cookie in two.

Changmin ate one half

Then he wrapped the other in the tissue he got from Heechul to be saved for later.