Light
He's trying really, really hard not to laugh; he really is.
But whenever he glances sideways at her expression, severely annoyed and just a shade short of a pout, he recalls the funniest sight he's seen in years.
Mirage, clad in little Lycra shorts (okay, so that doesn't make him laugh, just grin a lot), throwing her entire weight against the trainer he hired to teach her how to fight properly at long last, in attempt to take him to the ground, and just kind of bouncing off a six-foot-five wall of muscle.
Finally, she comes to a stop and wheels on him in exasperation.
"Buddy, if you don't stop cackling like that, I'm going to punch you!"
And he promptly loses it again.