Bodyguard!AU7 stories'The Bodyguard!AU Series is based on Earthsong9405's AU where Twilight is the bodyguard to a "Princess/Queen Rarity".' https://www.fimfiction.net/bookshelf/864137/bg-au
Official visits to Trottingham weren't the most exciting times for Princess Rarity, so what better way to fix such a problem than convincing her bodyguard to join her on an illicit exploration of the city?
When a terrible misunderstanding leaves Princess Rarity with the terrifying prospect of missing her bodyguard's birthday party, she decides that nothing or nopony will stop her from celebrating Twilight's special day.
After a long day, Princess Rarity's bodyguard is ready for a quiet night keeping watch over the Princess. Or, it would have been a quiet night had the Princess not decided Twilight's sleeping arrangements were 'simply unacceptable'.
Twilight takes her duties as Princess Rarity's bodyguard seriously. Unfortunately for her, it's difficult to protect a princess in a sea of costumed ponies when you have no idea which one is actually the princess.
Queen Rarity constantly rejected the advances of other noble ponies - after all, her bodyguard Twilight was already her secret special somepony. Unfortunately for them both, Sweetie Belle is intent on finding out who is her sister's secret crush