Such a cute little moment because Ymir has really taught Christa how to live. When they first met Christa was trying to find some noble way to die, as much as she denied it, I think it was very true. She was a scared little thing who was kicked out of her home, who’s name was taken from her, and who felt like she shouldn’t she even been born.
Yet with Ymir, she learned how to live for herself, and to not be afraid of the world anymore. She found someone to fight with and to fight for. Not only did Ymir change being with Christa, but Christa did too.