Twilight Sparkle. A friend to many people until the wedding.
Twilight tried to warn everybody that Cadenza was not who she said she was but to no avail. Eventually she was banished from the wedding, and left Canterlot. Years later, after the wedding which had been postponed, things were very complicated because they couldn't find Twilight Sparkle anywhere. Recently they have been hearing more and more about a gifted musician who is gifted in both music and magic: Andramora Glare.
Is this person connected …
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Humans with runes either on the wings on their backs, or magically on their wrists.
Warning! This story contains some moments of unsuitable stuff (bad sex).