"I'm always serious." He could be serious and still have fun.

Snart rolled his shoulders to stretch and maybe show off a little since Barry was looking. Who was he to deny a fan? "You're the one getting excited. Admiring me, hoping to get to see my knees, wondering what I look like without my jacket. I'm starting to think you might actually like me."

They were on a more level playing field now, not exactly allies, but they weren't adversaries. Being playful and at ease felt more natural.