With the end of the Friendship Games and both parties' tacit agreement of never letting the events leak outside either school involved, the situation has stabilized again.
Twilight Sparkle has been transferred from the Crystal Academy to Canterlot High School, allowing her not only to study in a less competitive environment, but also make some friends with the first people giving her the chance to, the Rainbooms.
Soon after her transferral, Twilight will meet an old, unexpected and unwanted, "acquaintance" in her new school. But he's only the herald to the unusual events that are soon going to follow....
Crossover with Harry Turtledove's book series Crosstime Traffic. Set after "Friendship Games" and before the stinger at the end.
Editing credits to DarkZonker.
Cover Art Credit to marking