Huh.
Interesting!
I'm intrigued to read on, please update =3

There's been a bit of an RAPR fanfic drought lately, so I was very happy to see this on the front page! I'm glad to see you took a new approach to this sort of story. I like that you establish their innital dynamic through dialog rather than explicitly stating it. The parts that really stand out are where Red and Purple interact, even in terms of how they're written. While your dialog is wonderful, the narration is a bit choppy. Your grammar is great, and you know how to use a semi-colon, so major points on that. I think if you stick with it, you'll find the narration getting easier and clearer. I hope you continue this!