Chloe & Max
It would've been so easy to play it off as a joke. And maybe it kind of was at first and she hadn't meant to say it. But she was honest when she said she did love Max. She couldn't pinpoint when she had fallen for her or why or how or anything, but that didn't matter to her. All that did was that she loved Max and know Max knows.
So she decided to be serious for once and tell Max how she really felt. And once she did, she became extremely anxious and tried to act as calm and cool as possible. But when she returned those same feelings, she felt a huge relief and she broke into a smile. A genuine smile that Max probably hadn't seen in a long time.
"Really? I'm so..." she broke off. Happy, glad, all of the above. But instead of saying so, she decided to show how happy she was by kissing Max.