I have a sister and I don't agree with your statement

@Banana here happens to express the desire for romantic relationship, in which case is by far the most outside of any speculations, as such cases are usually foreshawed (blushing) for it to not surprise the audience and call it bad writing, Thus, given their interaction of playful hostility, I can easily disagree and express a much more befitting word for their relationship at this far of the story, I can politely say L take whether it hackles your cojones. As my "sibling" take is a much more grounded and logical conclusion. Calling it romantic is reaching the stars at this point.