With characters from one of my other stories, 'Sunny Knight: a pony's tale', Her first apprentice takes place in the mane story arch of 'My Little Pony: Friendship is magic', many years down the road when the newest princess comes of age and is ready to take an apprentice under her wing. Meanwhile, elsewhere in the Crystal Empire, a small yellow foal, named Sunny, looks to be adopted and taken away from a less then enjoyable life at an orphanage where he feels absolutely alone. Both of their dreams are about to come true, in ways they both couldn't possibly imagine.
Single shot fic, not going to elaborate further.
Chapters (1)
You know as it so happens this has some basis in historical fact though I don't know if the same rules would apply to dragon scales for armor. The black paint of black knights did indeed do much to prevent rusting, a significant help when more often than not black knights had no squire to care for their armor, (Or even help them in and out of it!). Even some knights sworn to lords did it when a job requiring err, plausible deniability did this to their armor to hide their allegiance.
An example of modern recreations of blackening armor
Again probably wouldn't apply to dragonscale armor but I don't have a major in dragon biology so what do I know.