Rainbow Dash shows a surprising amount of manipulation to get Twilight out for a romantic night. Rarity might have helped a little.

Cover art by DoktorRainbowFridge

One day, Spike is alone in the library tidying up when he receives a letter carrying a confession of love from his own affection, Rarity. But as he soon finds out, it's not what it seems. Caught up in a prank war, he then teams up with the lovely mare to exact revenge on the one who wronged him, and in the process, finally clearing the air between himself and the fashionista.