Looks like I'm bumping this up from the last page.
I found that a nice story. The writing was clear enough so that you could understand and visualize the story, without being so descriptive it's practically a college-level fanfic. I thought the simpler style worked for a fanfic with a concept like yours. I thought that made the story...sweeter.
So, Topsy CAN be nice! I was fooled. I seriously thought he was affected by getting struck, but it turns out a lot different. I suppose it worked though...I was doubtful that one of the kids could hit his head that hard! Now that I think about it, this was my favorite passage from the story:
"Mr Threehorn, Cera’s father was eating some leafs when all the sudden the rock stuck him on the head very hard indeed. Mr Threehorn stumbled and collapsed on the ground blacking out.
“Wow that must have been one knock on the head to make your dad collapse” Littlefoot said with some surprise in his force." 
Well, that was a sweet little story. I enjoyed reading it.
