Junior-chan

In this context, she is too embarrassed to play the game so as a result, make her heart throb.

"This should be enough. Now, please draw a card..."

For this sentence, she is very serious in what she wants out of her senpai with her usual cold tone. 

"If I win, you have to go out with me."

Lastly, she has multiple gasps when playing old maid. The first is astonished and the next is gasping out of admiration/love.