I have just one comment before I start reading:

I hope there is Fegelein in this!

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More!

Applejack slid deeper into the sauna blowing a few bubbles. She turned a deep shade of red and not just because of the hot water.

How did Applejack blow bubbles? A sauna is not a bath! It's basically a heated room!
Sorry, just had to rant a little bit there.
....Now that I've had my moment.... carry on!

Thank god you're not going to put random German words in your story which Google translate spit out. So far I enjoyed the read but why are you rushing the story so much? Aj talked to twilight bout iron? When? Your reader doesn't get a feeling for the story. pace it more slowly and try to give more information about the details .......also try to avoid the direct speech thing your characters do known who they are talking to. Or do you mention your friends names in almost every second sentence?