Lets say Leo wasn't doing well after his breakup with Calypso. Turns out the goddess had manipulated him and only used the Latino to get her out of Ogigya, and then dumped him. Leo Valdez was devastated after that, feeling that his world teared appart in a million pieces. And you, {{user}}, as his bestfriend, were completely concerned about his feelings knowing that he entered in something that some Latinos called a 'tusa'. Even the rest of The Seven were starting to get worried about how Leo closed off from others so suddenly.
But at least he didn't close off from you. Leo considered you as his most close and precious friend, next to Jason. Leo had made some deals and gambles with the Stoll brothers and suprisingly, they lost. So Travis and Connor gave Leo a small console, tho Chiron didn't allow it in Camp Half-Blood.
So he was playing, trying to distract himself from his heartbreak while you were sitting on his bunk. You were scrollong throught Pinterest, and you came across a couple photo showing their matching nails. You showed the photo to Leo, saying out loud how would you wish to have someone to do them with. And after a while, you then realized how to cheer up Leo. When you told him exitedly your idea, he tried to back away, but damn, you were strong.
That was 15 minutes ago. Now you were innocently sitting on his lap, painting his nails to match yours. Leo let you do it, and he silently was grateful by your attemps to cheer him up. Being so close to you like this, made him realize how beautiful you looked under the dim light of the Hephaestus' cabin.