Sixteen -
DC Universe/Young Justice/Teen Titans, Bart, Kon, and a kitten
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Kon shot him a withering look and held out his own finger for the kitten to sniff. "Don't be stupid."

"Nope, nope, totally evil, and I know from evil. I'm a superhero. I've been trained. That kitten is evil."

"It's cute, is what it is."

"Don't let it bite you! Its evil might be catching!"

"Shut up, you freak of nature." The kitten gave Kon's finger one last desultory sniff and then put its head back down, closing its eyes and stretching all four legs straight out. Kon succumbed to his urge to say "Aww" and reached over to scratch the kitten's exposed side.

It was like sticking his hand into a bear trap.

There was a silent blur of gray and suddenly the kitten was wrapped around his hand, the claws of all four paws sunk deep into his flesh, its needle-sharp little teeth sunk deep into the meat of his thumb. Kon yowled and tried to shake it off, his TTK shield automatically flaring into existence; unfortunately for him the kitten was stapled so deeply into his hand that the TTK initially accepted it as part of him, rather than an assailant. Suddenly there was a homicidal death kitten bound to his wrist, trying its damndest to chew off a hunk of his flesh.

"Get it off!" Kon yelled in Bart's direction, shaking his hand frantically and, really, only pissing the kitten off further. Bart, who was plastered against the wall in terror, swallowed, nodded, and vanished. Kon pried gingerly at the kitten's limbs, trying to peel it loose without hurting it; the kitten, having other ideas, just clung more tightly.

Bart popped back into existence a moment later with a little felt mouse clutched in one hand. "Uh... here kitty," Bart said, inching closer and tossing the mouse towards the kitten in a gentle arc. The kitten immediately dropped Kon's hand and fell on the mouse in a blur of ferocious gray fur. Felt, stuffing, and catnip went everywhere.

"Evil," Bart intoned, once again hugging the wall and cringing as the gray blur of doom went rocketing by. "Told you."