I love how you can tell that Blake is (likely) Yang's first love. Blake is certain. Comfortable. She's had enough bad experiences to know that what she feels for Yang is different from what came before.
But Yang looks dumbfounded, like she never even entertained the idea that she would have a romantic partner. Like she wouldn't even know what to do with romantic love even if it was right in front of her. There's... not doubt, per se, but a sense of "I have never been vulnerable in this way and I don't know what the fuck to do."
And Blake knows it, teasing her ("try and keep up!"), being patient with her with both the compliments back and forth and taking the kiss slowly. Like the way Blake blurts out "I love you too" you know she wants that woman, but she moves at Yang's pace leading up to the kiss. Blake is gentle with Yang. She's the only one who's gentle with Yang. She's the only one Yang would ever let be gentle with her.
Romance and dating are a largely unspoken part of Blake and Yang's respective histories, but there's so much subtext in this scene.
A scene brimming with subtext, while simultaneously hitting you with visual metaphors that are as subtle as a brick to the face.