Heroes Of Olympus: Hephaestus's Little Helper

Leo Valdez was sick of not being needed anymore.

He was sick of being the seventh wheel.

He just wanted to see the one he loved again.

And that was Calypso.

Leo finds out they're going on a quest to rescue Calypso from her island, which may be impossible.

But hey, Calypso thought loving that nutty mechanic was impossible.

I guess that means anything is possible.