This comic was started originaly as an alternate scene, when Twilight finds King Sombra's hidden vault in the throne room. I totaly expected, that Sombra takes notice and appears before Twilight.
But as I writed this one... it became something more, and I went into some fanfic direction

This story is just an idea of me, about King Sombra's youth and the way he learned magic. It would fit into the episode perfectly, if Sombra tell Twilight about his ways, so Twilight could see the wrong way, where she shouldn't go. As a part of her test.
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*blushing and watching the video*
First off, I really enjoyed the style, you had a unique feel to it. Almost anime, but not quite. Which is good.
The story was believable, though the lines chosen by Sombra did feel a tad... 'Suggestive', for lack of a better word.
As for grammar, I understand you aren't a native English speaker, and as such, I can say you did a rather good job on it overall.
Shame on those who so saw fit to put you down for something you cannot help. You did the best you could, and I can legitimately say that it was an enjoyable read.
Keep doing what you're doing.