“What’s funny!?” Heatwave is still on the defensive but his tone is softened. He can’t bring himself to be huffy and mad when he feels good.
Kade laughs harder, but offers, “You really wanna know? Think the name I heard you guys use is ‘self-servicing’.”
He continues scrubbing, grinning just a bit that he knew enough Cybertronian colloquialisms to try to embarrass his friend—not maliciously, of course. More because he knows Heatwave can take it, and knows Heatwave can figure out what he really means.