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You asked some relatively basic-to-reviewing questions in your posting, but since your questions lead in nicely to what I have to say, I'll answer them:
>is the story interesting?
Yes, in my opinion. It was actually well-done. Your pacing was almost spot-on, you did a good job at making your jokes plausible (in-'verse) and avoided running them into the ground. This is one of the few comedy fics I've actually enjoyed.
>Anything that should be fixed?
I'd hardly call myself a reviewer if I couldn't find at least something for you to work on.
First and foremost, I noticed a few instances of epithets ('the mare') which could have been omitted; also, there were a few instances of passive tense. For the most part, your grammar was clean enough to let me get engrossed in the story, so I can't really say your grammar was rough; however, do note that I'm not usually the best person to ask about grammar.
I suppose one of my not-necessarily-critiques, but observations is that Twilight's mom is German. Now, I have no hatred for random German heritages (though maybe here's a critique—it comes about quite abruptly, with a German word I needed to Google), but in this story, almost everything had a purpose. The plant party was zany on its own right, but you also did the bit with Rarity getting dirty and with Twilight / Fluttershy having to stay late for it. The bedtime was an intro to the main conflict of this story. Twilight's destruction of the house and the resulting bars came up. The bit with the novels... heck, even setting the last scene at Pony Joe's gave the quick, "Oh, Hell, she's back!" line.