Caleo

Caleo is a het ship between Calypso and Leo Valdez in the The Heroes of Olympus fandom.

Fanon
This ship is relatively popular in the fandom.

Trivia

 * The name Leo is one of the twelve zodiac signs which has fire as it's element.
 * Thalia Grace was Leo's first love interest, and she is the only one who is at least partially human. The love in question were all one-sided on Leo's part, though.
 * Calypso is the first out of four love interests to genuinely have any real romantic interest in him.
 * Leo is the only man who has ever reciprocated Calypso's affections and actually wanted a relationship with her.