Basically, this is brilliant. Not only so in its sheer adorableness factor, but also in the simplicity used in the design and execution.

The one element I really like is the lack of dialogue. I feel it adds so much to the piece overall to just let the actions speak for themselves, as it is. The lack of dialogue lends a lot to the entire piece.

I also really love the concept of Rainbow Dash + Scootaloo sisterly love, so that scores it high for me, even if Scootalove is a rather well-explored concept.

I also enjoy the everyday-ness of this scene, I know it can be easy to, when attempting Scootalove, label her as a depressed orphan who later gets adopted by Rainbow Dash, I've seen stories done that way many times. What I find appealing about this particular idea is that it puts Scoot and RD in an everyday situation, showing how Rainbow Dash can be compassionate at all times. This seems a tad more realistic.

My only complaint is that Rainbow Dash's hoof in the 7th panel seems to come from about the height of her head...

Again, beautiful work.