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
After a recently thwarted assassination attempt against Rarity, Twilight and Rarity discuss the soldier's uncertain future as the queen's private bodyguard.
For Twilight, the increased lifespan that came with princesshood had forced her to outlive her friends, but thanks to Rarity, she will learn that centuries could be lived in but a single day.