The dazzling messenger disappears in a glittery poof of blue and pink light, leaving behind a single letter.
You immediately recognize the handwriting of the subject of the letter you've just sent on your way through the messenger.
"Letter swap," a voice whispers in your ear. You smile.
"Thank you, Aphrodite's Messenger," you call out loud.
(I know, I know, it's not Valentine's Day yet... but the story matches
)