He jerks a little, surprised to have an organic just jumping at him, but when he realizes it isn't an attack he goes courteously still. He could shake her off if he wanted to, but he doesn't see a need for it. He just vents a heavy sigh through his system and holds out one arm, like he's seen humans do with their feathered organics.

Hopefully she'll know better than to ever try this kind of thing with someone like Knock Out.

"Yeah, energon. But once we refine it, it's more like drinking. And we don't have anything like, uh, 'catnip'."