Based off of Headcanon #379: Jason and Leo snuck off to be alone the same night as Percy and Annabeth - only they didn't get caught. Leason, with mentions of Pipazel and Percabeth.

Three wars. Three wars, they've gone through. You'd think it'd be enough for them. It's more than enough. It's more than enough for all of them. It's more than enough for any human being. But when the gods smell trouble, and ask them for one last favor. How could they possibly say no? Like this: "NO!" It didn't work. So off they go and did this one last job for the gods, which the gods say is for the better of everyone, and went off to this place where this trouble starts. What is this place? High School. Disclaimer: All Rights to Rick Riordan. Sequel to War of the Gods.