"Just 'cause she's never cared about anypony else's feelings doesn't mean we shouldn't care about hers." Kind words spoken with the purest intention can still be mistaken. Diamond Tiara cared a great deal for one pony's feelings in particular, and becoming the pony she wanted to be had meant hurting her.
Rated Teen for implied incest.
Written for the Foalcon group's Safe For Woona 670-member 'Foal-mance' contest.