Pia was going off of in-episode facts about Spike, which never said anything about dragons growing wings. That was josh haber’s doing and his track record for episodes is pretty rotten since he couldn’t even keep spike’s flying abilities consistent between the two episodes.
@Psychopomf
The fic is a “what if” scenario about Spike (Greenfire) if he was never raised by ponies and lives by himself. One day, he meets a unicorn named Rarity who was gem hunting in his territory.