I would like to take a moment and answer two of the personal message questions I have received several times with the last few chapters to eliminate confusion and clear up some lingering questions behind this.
Q: Harry and Draco have both a more human appearance and then their creature forms, right? So, why do they seem to hide the creature one after the train station battle? Isn't that a little confusing?
…To this question, I applaud your observation skills and think that perhaps I have been slightly less clear on it than I should have been. Maybe when the story is done I'll go back over it and clean it up a bit.
Yes, Harry and Draco have a human form and their creature forms. They are interchangeable and it does not take much magical energy to do, just time. The human form will only last for certain amount of time now though before they are forced to live in their true appearance each day whether they like it or not. For us the equivalent would be having a set of clothes we really like and decide to wear for the day.
Then we end up in some situation where we utterly ruin it, so we have to go and change it while we dispose of the ruined clothes.
However, try to remember that Harry has truly only shown his true elven form to a few students at school as well as a couple professors. The mass majority of the school, ministry, staff of Hogwarts and their community have not seen him like that, so they are unaware he has truly changed in appearance at all.
Draco has only ever shown Harry his true self in full except during his outburst when Narcissa died.
The battle at the station was slightly off in description as I re-read through it. They did show a lot of the new appearance, more than I anticipated...but keep in mind that the changes are interchangeable. Harry and Draco from what I should have written had only exposed physical attributes in small ways and a show of much increased power.
However, I failed there and I apologize.
Q: Harry and Draco are so out of their character, and maybe it is due to the way they've changed to help deal with their new forms, but how did they get so trained if we haven't read any training parts?
A good question…true, I have not written any chapters where it has shown the two training together so their abilities seem unrealistic and out of character for the roles they play here.
The answer to it is rather simple if one carefully reads the beginning chapters.
Harry's inheritance changed him by force due to his bad experiences at Number Four, thus catapulting Draco's early as well so they would be able to relate mentally due to their true age. When most think of training, they assume something of a strict regimen.
Harry never really mentions all the details in one go of his inheritance as that was done over the course of many chapters, but in reality, training for them is more just like knowing an incantation and doing it over and over until they managed it.
Most of the special abilities are inbred and will work because they are genetic or are granted through mating. Most would not require a difficult training to wield unless the body rejected the gift or the person's mate was not used to having such a power in their blood. Harry and Draco are both pureblood in this and their lineages are ancient, so all their special abilities do not require massive training as both clan's have mated others through the centuries and have had innumerable types of powers become one with their family's blood.
I will say that Harry and Draco do have one special ability a piece that has not shown yet, and this will require training to handle though.