This is an ongoing story, which takes place in pre-series, then in the middle of it. While it is with ponies, it focuses more on dragons from an parralled Earth, where a war between humans and dragons took place before the true story. The plot of it, will not spoil yet, will be a dark one, with more action in it than any other stories.
The protagonist of the story is an last surviving dragon from the parralled Earth, that are transported to Equestria by his then-dead parents, being taken cared by the residents of Equestria's royal palace in Canterlot, though in secret at first.
I think that's all I'll reveal at the moment. I hope you all will try and check it out. You'll find more description on the plot by reading the story on Fanfiction.net (not on Fimfiction).