Silver and Lance are both with the royal guard, and have both been stationed at the same post, handling different shifts. Silver is a thestral with the Lunar Guard, while Lance is an earth pony with the Solar Guard. Lance is big for an earth pony, and Silver is small for a thestral. Whenever they change shifts, Silver can't help but think about him. Eventually, her mind is too much for her willpower, and she lingers after her shift one night to talk to him.

Lance knows what she really wants.

(Non-romantic smut fic. Contains size difference light musk mild cum inflation and a stallion who's too smug for his own good.)