Okay guys, this is a little bit brother sister fluff before the mission, which is next chapter. Plz review!

"Gah!" Sparrow jumped and staggered back, seeing her pursuer fast approaching, a ducked down the hallway.

"I'm going to get you!" Robin grinned and cackled.

"Not on your life, bro." Sparrow reached the stairwell of the cave and jumped onto the banister, staring at the four flights of stairs... A thirty foot drop to the ground, enough to kill her if she landed wrong...

She grinned and jumped, flipping three times in the air and landing in a perfect crouch, hands on the ground. She dove out of sight and pulled out a vent, crawling into the duct and replacing the grate before turning and starting to crawl.

Robin reached the banister and looked down. Sparrow was no where in sight. Robin gulped. There was no way his sister had done something so crazy as to jump- had she?

He jumped, struggling on the landing but managing. He shouldn't have tried to fit in five flips while in the air...

He turned around, finding a strand of raven hair in the hallway and grinning. His first lead. Sparrow smiled as she watched from the grate above. She'd dropped the hair not a moment too soon, and Robin had fallen for it...

Suddenly, without even looking at her, he whirled and jumped up, pulling out the grate.

"How did you know?" Sparrow asked, as she crawled away from him as fast as she could.

"It was too obvious- I knew you'd never leave a clue so simple. So it was obviously a diversion. Now get over here!"

"Never!" Sparrow grinned, sliding into another duct, the one above the kitchen, before kicking out the grate beneath her and landing on the island. She saw Black Canary, Batman, and Superman all staring at her with shocked expressions but ignored them, springing up from her crouch and shooting her grappling gun up into the rafters...

Batman smiled slightly, watching his daughter fly with practiced ease and flip onto the rafters. He had no idea what she was up to, but her stealth had been incredible- even he hadn't heard her coming.

Robin landed on the island next, normally perfect hair messy.

"Where?" he asked. Batman pointed towards the rafters.

"Aha!" Robin launched his own grappling gun, landing on a rafter beside hers, and she quickly jumped away.

"Traitor!" she yelled down at Batman, who simply smiled. He was going to enjoy seeing this play out.

Robin flipped forward, onto the next rafter between them, and Sparrow vaulted backwards in a perfect flip, landing in the crouching position again, eyes trained of Robin, ready.

Suddenly her brother threw a barrage of birdarangs towards her, and she was forced to move in order to jump out of the way. She tried to dodge, but the movements she was doing were too fast, and she ended up falling...

She had barely fallen ten feet before a grappling hook latched onto her boot, and she saw Robin had shot off his grappling gun and was pulling her up towards him, a victorious smirk written on his face...

"Not today." Sparrow pulled a birdarang from her own belt and moved, slicing the very wire that was pulling her to safety and heading for free fall again, whipping out her own grappling gun and catching herself, swinging up and landing on the beam behind Robin.

"Well played." Robin said, smiling.

"Touché." Sparrow replied, smiling as well.

"What are they doing?" Canary whispered to Batman. Batman just shrugged. "Let's find out."

"Hya!" Robin went at her with a flying kick, and she back flipped away, sticking her tongue out at him.

Robin threw a birdarang at her, but she simply reached out and caught it between two gloved fingers, sliding it into her utility belt.

"Give up, Sparrow. There are no more places for you to hide." Robin said, holding another birdarang at the ready.

Sparrow simply raised an eyebrow and fell back like it was a trust fall, landing safely on the couch and bouncing up, flipping twice before landing in her crouch.

Robin was surprised for a moment before he did the same, He and Sparrow both took fighting stances, ready to duke it out, when Robin threw a small ball towards her. It opened into a net and wrapped around her, trapping her.

She struggled fiercely, reaching for her birdarangs.

"Oh no you don't." Robin said, smirking as the eyes of his mask narrowed. "I've been waiting for this for a long time..."

"No..." Sparrow whispered, eyes closed, praying it wouldn't happen.

"Tag!" Robin yelled, tapping her head with his hand before racing from the room.

Sparrow's eyes flew open and she sliced the net to scraps. "So not cool, Rob!" She yelled, racing after him.

Black Canary blinked. "Tag? They're playing tag?" She asked, looking shocked.

Batman nodded. "I figured. Ultimate Aster Tag, they call it. I figure it helps them with training, and they love to play it, so why not?"

Just then Robin raced back into the room, ducking behind a potted plant and trying to hide. It nearly worked, but a bit of his hair was visible, and Sparrow grinned, grabbing the full watering can off the table and pouring it all over her brother's head.

"Hey!" Robin choked out, still coughing, as she ducked close to him.

"Tag! You're it!" Sparrow yelled, running away.

"So not asterous, Sparrow!" he yelled, taking off after her.

"Get traught, bro!" She called back, before they dodged out of earshot again.

"That's tag? More like beat down." Canary said, looking shocked.

Batman shook his head. "Just be glad they aren't playing the Mattress of Doom."

"Mattress of what?" Canary asked, but Superman stopped her with a raised hand.

"Trust me, you don't want to know." he said.

Then, there was the sound of glass shattering, followed by Sparrow's, "Robin did it!"

"Robin isn't here right now, please leave a message after the tone!" Robin yelled. He'd clamped his hand over Sparrow's mouth and was slowly working his way towards the safety of his room.

At the sudden silence, Canary looked over at Batman. "Should we be worried?"

Batman shook his head. "Now they practice stealth. Always happens after they break something." he said, smiling slightly as he headed towards the zeta tubes. Whatever the kids had broken, he didn't want to be the one to find it. Behind him he left a Black Canary and Superman, who both wondered if all bats were this crazy.