Caleb is just innocently waiting for a dry shirt, that's all.

...Okay, so maybe he knows what he's doing, and maybe he just likes flirting with Gabe. But it's totally harmless. He smiles, conveying the harmlessness of no shirts.

"If there's a dryer I can use, I can even get the clothes back to you before I leave." He takes hold of the waistband of his cotton shorts like he's going to take them off now, too.

(He isn't, but he wants to see if he can make Gabe blush.)