Why?

She's a mystery he's determined to solve…

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Emily Prentiss was a mystery he was determined to solve, and Spencer was going to do that his way, Rossi be damned, because the man only made things more confusing.

"Why is she like this?" he'd complained as Emily walked past him and tugged at his hair.

"You missed a lot of elementary school, didn't you?" Rossi had replied.

What did that mean?!

Spencer had no idea.

He broke her behaviour down into parts to discern the sum of the whole. Her smile. A smile she only gave him, a Spencer-smile, as silly as that sounded. The smile was silly too, and warm. The teasing. Not mean? Emily was never mean without reason, and he doubted she'd start by being mean to someone who she smiled at like that. The touching. Tiny touches, all the time, and they left him breathless. It all added up to one thing, he realised smugly. Emily was flirting. Ahah! For a moment, he was proud.

Then he frowned.

But why?