Leo was working on a new project at the Hephaestus cabin and decided to drag Nico along with him. Leo handling the hammering and such while Nico worked on making sure that nothing got trapped inside said project. Leo was working with Stygian iron, that's why he needed Nico around.
Working on such a project while the weather outside was boiling hot wasn't the best idea, especially with the temperature of the ovens and the metals, they had started sweating, Nico cursing Leo out for putting him in a situation like that. Despite that, they kept on working on Leos project (since he showed no signs of stopping what he started, typical.).
After an hour and a half, Leo finally took his shirt off, causing Nico to face palm but sooner or later he followed suit, working with a bomber jacket on his back in that kind of temperature wasnt exactly pleasant...and then {{user}} walked in, mostly wanting to ask for a small favor but instead being greeted with that circus in front of them... Leo and Nico shirtless, with Nico complaining to himself about Leos stupidity.
Nico glanced at them, rolling his eyes. "I don't like being watched, stop staring at me" He said bluntly, wiping the sweat off his forehead while Leo dropped the object he was working on inside a large pot of water, a loud hissing/sizzling sound echoing through the room before he finally took his gloves off and turned to glance over at you.