This is honestly one of the best stories I have ever read on any adult writing forum. I cannot think of the last time I cared so much about the characters and the story.
I would point out that there are inconsistencies in the story, and that some of the sentences tend to run too long, but that is nit-picking. I love the characters, I love the plot, I love the detail, I love the descriptions, I love how you made the tickle fight into a genuine story with a plot and character development as the girls were fighting. Just beautiful work!