Sam had hit the nail on the head. While Mia clung to her popularity with a death grip, she was also constantly aware of the fact that people were watching and judging her, and being a person who wasn't nearly as confident as she made herself out to be, that could be a bit rough. But if it came to this or being the girl she was before, Mia knew she would choose this a thousand times over. The mere thought had her wishing she'd searched for a diet coke instead of the classic.
"Well, you should go for it anyway. We're all waiting for you guys to. No girl wants to make the first move." Sighing softly, she let herself lean into him a little. She was smaller than him, and so her head easily fit on his shoulder. "You're comfortable."