Description: Prince Blueblood dislikes being secret agent Double-O-Zeta, but since no pony does it better, the princesses won't let him quit. Trailing the mad unicorn Green Briar to Ponyville, Blueblood runs into Rainbow Dash, already investigating the odd new pony in the area. She resents this jerkwad of a prince suddenly butting in, and when circumstances force the two to work together, the unexpected feelings they arouse in each other might prove more dangerous than anything Green Briar has planned.
Thanks to Aquillo and cheeze sauce at Saltblock, Cloudy Skies and Bad Horse on FimFiction, and Casca from mlpchan's /fic/ board for practical and moral support.
In Their Highnesses' Clandestine Corps
Piefall (Sequel Act 4!)
Additional Tags: The name's Blueblood. Prince Blueblood.