(Disclaimer; I own nothing but my Genius.)
When Sirius and Katrina reached the meeting place, just in front of the portrait hole, they found only Remus and Peter there.
"Where's James?" squeaked Peter, who always got jumpy before a prank.
"No idea," Remus admitted. "I reminded him about the prank, but…well, y'know, he was with Lily."
Sirius let out a groan of despair.
"Oh Merlin, no!"
"Don't panic, I'm here," said James, laughing and emerging from the shadows with Lily hanging onto his arm.
Sirius gave him a look. "Then let's go." He eyed Lily. "Are you coming?"
"Yes," she replied simply, giving him the benefit of her green-eyed glare. Sirius, never having had the pleasure before, cringed and subsided with a subdued, "Ok…"
They were rather held up on the way to the Slytherin common room by Sirius-and-Katrina and James-and-Lily, who stopped at various points along the way to insert themselves into dark corners. It took Remus and Peter considerable time and effort to extract them and, by the time they had reached their goal, time was running short.
Sirius having charmed the dour portrait of a nun into letting them into the Slytherin tower, they sneaked up into Snape's dorm to begin their task.
James, slipping easily into his role as leader, began to organise the rest of them as, magically, they moved all the furniture from the room up some stairs, out of a trapdoor, and onto the roof. Lily remained glued to James' side, laughing every so often as he explained the next stage to her.
When the room was completely empty, Remus turned to Peter.
"Do you have the paintballs?" he asked.
There was a tense silence.
"Yes." Peter was proud of himself; he'd done something right for once.
Lily felt James relax slightly beside her. Sirius, ever unrestrained, let out a whoop of delight and slapped Peter on the back. "I am so fucking proud of you mate!" he yelled.
Peter glowed. (A/N; Just wanted to emphasise that they are NICE to him sometimes…oh, y'all like my prank idea? I'm kinda proud of it myself!)
When the paintballs had been duly produced and shared out, Remus was voted the best shot and allowed the honour of first throw.
He licked his lips, closed one eye and took careful aim.
Splat.
The side of Malfoy's bed exploded into lurid blue; the rest of them applauded wildly.
Sirius started the fight.
Well, how could he not? The back of James' head was such a tempting target…
Splat.
Paintballs flew thick and fast; soon not only the furniture, but every Marauder there – and both girls – were covered in layers of brightly-coloured paint.
Sirius snared Katrina around the waist as she pelted past, Remus in hot pursuit. Remus' carefully-aimed paintball flew harmlessly past to explode on Snape's dresser, and Katrina let out a squeak of surprise as she landed beside Sirius on Malfoy's bed.
She wrinkled her nose. "Yuck. Stinks of Slytherin."
Sirius grinned. "Well at least it's not Snape's," he pointed out. "Besides…" He buried his face in her neck. "You smell good enough to cancel it out."
Katrina smiled quietly, secretly melting.
Suddenly her eyes gleamed. "Sirius?"
"Oh Merlin. What is it?"
"I have an idea…but it all depends…" She subsided thoughtfully.
"On what?" Sirius pressed, intrigued.
"How far you'll go. And how far Lils'll go, and James, to freak out the Slyths. Will Snivelly and Malfoy be back soon?"
Sirius nodded. "Prongs and I were just planning on hexing them…but you have a better plan?" he queried.
"Yes." Katrina stuck to her point. "How far will you go?"
"To piss off those two? As far as it takes!"
Katrina smiled, and gave him an excited kiss. "Excellent."
She began to whisper in his ear. Sirius' grin widened. Then his eyebrows shot up.
"I like it," he commented, when she was done. "Daring, fun…and it'll get Snivelly right where it hurts."
Katrina went to ask James and Lily what they thought.
After much skirting round the topic, she finally came out with it; Lily fought not to smile and turned questioningly to James, who was beaming his enthusiasm. They eyed each other for a moment, then spoke simultaneously.
"We're in."
The six sprang into action; Remus and Peter were dispatched as lookouts, and the other four retired to the two large beds which they had 'rescued' from the Slytherin dorm to make their paintballing range. The sheets and blankets were covered with paint; but then, so were the Marauders.
Sirius, grinning, unbuttoned Katrina's shirt halfway and took off his own. She slid paint-covered hands over his chest; he ran his own through her hair, leaving blue streaks behind. Katrina, laughing, flopped back onto the bed and held out her arms. Sirius lay down, supporting himself over her on one elbow. For a moment, they just stared into each other's faces; then Sirius kissed her, very lightly, on the lips. Katrina responded eagerly, letting her hands rove. (A/N; Ok, I think we've established that they're enjoying themselves…now over to James and Lily…)
Lily fumbled for her lipstick and smudged it on so it looked like it had been kissed off. The she planted a lipstick-y kiss on James' cheek, and smeared more of it on the corners of his mouth. James chuckled. "Nice touch," he commented, licking his lips experimentally and grimacing at the taste.
Lily smiled timidly.
"Sure you want to do this?"
Her smile grew bolder. "To freak out the Greaseballs? Hell, yeah!"
James swallowed. He'd never dreamed it would feel this good to have her actually want him.
Swamped by yet another flood of emotion, he pulled her down onto the bed, took her chin in both hands and kissed her harshly. Lily shivered against him.
They both glanced over at Katrina and Sirius, who had…progressed somewhat; Katrina was straddling Sirius, her hair masking his face, and Sirius' hands were sliding up her thighs.
"Want to try and beat them?" James asked.
Lily, looking wicked, nodded.
James smoothed the silk of her dress down her leg, and then slid his hand up the other side; Lily nuzzled into his neck, nipping it lightly…then there was the sound of shouting from downstairs, Remus' cry of warning, and next second the four were face with a furious Snape and a white-faced Malfoy.
"How the fuck did they get all our stuff up here?" Malfoy demanded. His gaze drifted over the two beds. He did a double take. He stopped…and stared.
Snape appeared to be having trouble breathing. "Wh-wha-?" he stammered, backing off.
James kissed Lily again, slowly and deliberately. She arched against him with a little moan of approval.
Sirius, meanwhile, was eyeing the two up and down, his lip curled. "Fuck off, perverts," he demanded, looking incensed and superior at the same time.
"Yeah," Katrina joined in, shaking her hair back from her face and laughing. "Didn't know you were into voyeurism, Malfoy," she added dryly.
James let out a bellow of laughter.
Sirius licked his lips pointedly. "We can carry on, if you like…" he put in suggestively. Lily nodded her agreement and tangled her hands in James' messed-up hair.
Snape seemed to unfreeze. "Get the hell out of my bed!" he screamed, his voice high with fury. Lily giggled.
Sirius turned calmly to Katrina. "Well babe, you've had your fun. Now can we hex them?" he asked hopefully.
Katrina shrugged. "Whatever Turns You On," she quoted airily.
Sirius, never having heard the Virgin advert, gave her an odd look but then caught James' eye. "On your left," he commented, a second before James was hit by the bundle of infuriated black robes that was Snape.
"Petrificus Totalus." Lily had produced a wand from somewhere, and had it pointed at Snape. James shoved his enemy's now-prone body off him.
Malfoy turned to flee, but Sirius did something with his wand that tripped him as he ran. He landed with a satisfying thud. "Petrificus Totalus," said Katrina, for good measure. The others joined in.
"Furnunculus." Snape sprouted boils.
"Elongior." Malfoy's hair turned green and grew a few inches.
"Nonullius Vestimenta." Both the Slytherins found themselves naked except for their boxers; two sets of robes landed in James' outstretched arms. Grinning insolently, he held then up, shook them tantalisingly, and tossed them over the balcony.
"Catch them if you can," he mocked; then, grabbing Lily's hand, he led her off the rooftop and back down the stairs. Sirius seized his shirt - and Katrina - and did the same.
Behind them they left two livid, helpless, near-naked Slytherins, unable to move on a rooftop crowded with the contents of their bedroom…