Nine -
DC Universe, Kon-El (Superboy), Tim Drake (Robin 3), Bart Allen (Impulse)
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And really, it wasn't totally unfair to get into a snowball fight with a TTKer (WHOMP) when there was a speedster involved (whomp-whomp-whomp-whomp-whomp-whomp-whomp-whomp-whomp-whomp-whomp-whomp), and since Tim's aim was perfect, trained and deadly, and his snowballs hit with the force of rocks (whud!), it all worked out in the end.

If only it wasn't so hard to hit Bart. They'd already gotten into one yelling fight over whether vibrating to let the snowball pass harmlessly through him was cheating or not, and Bart had pointed out that using TTK like a shield to deflect snowballs was also totally cheating, at which point Tim popped out from behind a tree and nailed them both while they weren't paying attention, and the argument was forgotten due to their extreme need to chase Tim down and rub snow into his hair. They couldn't find him, though--Tim was so good at not being seen that it was almost Pythonesque--and so they turned back to trying and failing to pummel the hell out of each other.

And then Bart screeched to a halt a hundred feet away because he'd lost sight of Kon, and Kon saw his opportunity. Scooping up every bit of snow within ten feet he reached out through the ground to grab Bart's ankle with his TTK, and Bart yelped and tried to vibrate free but he was trapped, and Kon howled in triumph and launched half a ton of snow straight at Bart.

Unfortunately, it wasn't until the missile was already airborne and beyond his reach that he saw the pair of kicking legs sticking out of it.

The airborne avalanche exploded in Bart's face, throwing snow everywhere in a white haze, and Bart's shriek of dismay was cut off abruptly in the middle by a very loud and obvious THUD. "Oh crap!" Kon launched himself after the snowball, hovering nervously a few feet over the site of impact. "Tim! Bart! Uh... you guys okay?"

Bart was sprawled out on his back, sunk deep into the snow, his eyes wide and rolled up into his head. Tim was curled up on top of him, hugging himself and gasping for breath. "Did anyone get the number of that truck?" Bart wheezed, twitching in random places. "I think it was packing heat..."

"K-O-N-E-L," Tim said, narrowing an eye up at the sheepishly hovering Kon. "Low-rider. Underpowered engine in an oversized chassis. Really garish paintjob."

"Hey, that was totally low!" Kon dropped back to the ground, kneeling by the pile of his buddies, and reached out to hover a hand uncertainly over Tim. "... no, really, you okay?"

"I'm fine," Tim said irritably, at the same moment that Bart said, "I think my rib's broke!"

Tim immediately threw himself off Bart. Bart blinked up at the sky for a moment, his form blurring slightly (and throwing little jets of snow everywhere), then said, "Okay, I'm better now!"

Tim eyed Bart narrowly. Kon looked at Tim. Then it finally dawned on him, and Kon's eyes widened. He spluttered. "You were sneaking up on me!"

"We were having a snowball fight, remember?" Tim shook the snow out of his hair. "Yes, I was sneaking up on you. So?"

"So... so... um." Kon flopped out on his back in the snow. "I don't know. But you both totally deserved that, and I win."

A pair of snowballs promptly exploded in Kon's face, and he bellowed, and by the time he managed to shake his eyes clear both of them were on him, and they fought and yelled in the snow until it had melted in a circle ten feet wide.