A/N: I don't own Glee, the characters Blaine Anderson, Sebastian Smythe or the Avengers.
"BLAINE ANTHONY ANDERSON STARK! WHEN I GET MY HANDS ON YOU - " was bellowed from above them.
It was followed quickly by a "SEBASTIAN BRUCE PHILLIP SMYTHE BANNER! I'M GONNA KILL YOU!"
The boys glanced at each other before desolving into giggles. They glanced towards the glass of the lab door as footsteps came pounding down the steps into their basement.
"JARVIS? Please initiate protocol Alpha-Niner-Sixer-Beta," Sebastian called lazily to the AI a they watched the two men approach the lab door in anger.
"Of course, Master Sebastian," the computer intoned in reply. The glass walls gave them a great view as JARVIS initiated the biological attack protocol in the hallway outside the lab. They had tweaked it a little bit, knowing that the present they had left for Steve and Clint would garner such a reaction.
Hawk was the first to notice something wasn't right as he came towards the door of the lab. He stopped, glancing around wearily as the ceiling above both his and Steve's heads opened. Suddenly, they were covered in foam; skin dying blue foam. The boys laughed hysterically at the two men, safely hidden in the lab until they felt two hands clamp down on their necks simultaneously.
"Alright boys, I guess it's time for another chat," Natasha intoned, propelling both boys to their feet and towards the door where Steve and Clint glowered in the blue foam.
"Come on, Aunt Tasha," Blaine pleaded, eyeing the two angry men wearily. "We were just having a little bit of fun."
"I think it's only appropriate, Blaine, that Steve and Clint have a little fun too, don't you?"
Sebastian smirked. "It's the least we could do, B," he replied, glancing at his friend. "After all, with the chemical compound in the foam and the blue dye, they'll be smurfs for at least two weeks if not longer." Blaine glared at him in reply.
"I do not understand," Thor commented, taking in Steve and Clint. "How are you blue? Have you developed some sort of skin ailment?"
Clint glared over at the two boys seated at the kitchen table, tinkering with something. "No, Thor, you can thank your nephews for this," he growled.
Thor was even more confused. "How did Blaine and Sebastian turn you blue? Was it enchantment?"
"It's a long story," Steve replied, taking in the two boys who were whispering conspiratorially Sebastian nodded to whatever Blaine had suggested and they were getting up from the table with their experiment. "Wait a minute, boys!" he called before they left the room. "What is that?" he asked wearily, pointing to what appeared to be a gun in Sebastian's hands. The other two Avengers also turned their focus on the two boys.
"Oh, it's something we're experimenting with," Blaine replied airily, waving his hand to show non-concern.
"Show me," Clint commanded, not trusting his nephews.
Blaine bit his lip. "That's not a good idea, Uncle Clint," he stated, looking over at Sebastian.
"Now." There was no room for further argument.
"Um, okay." Blaine nodded at Sebastian who pointed the fake-gun at Thor and pulled the trigger. Suddenly, Thor began to sprout red, angry boils. "It's a biological weapon," Blaine supplied hurriedly. "The boils will disappear in approximately seventy-two hours after first appearing. There should be no linger side effects, but we haven't had a chance to run all the numbers yet which was why - "
Steve took in Clint's horrified look and Thor's angry one before holding out his hand with a sigh, interrupting Blaine's explanation. "Give it to me, boys," he ordered. Sebastian sighed dramatically before handing over the gun. "No more playing with biological weapons."
"But Uncle Steve," Sebastian protested.
"No. No more biological weapons. Your fathers will be hearing about this when they get back from the conference."
Blaine opened his mouth to protest, but closed it when Thor made an angry grunting sound as he caught his reflection in the window and realized the extent of the damage to his skin.
"Oh, shit," Sebastian stated at the thunderous look appearing of the god's face. "Run."
He and Blaine took off from the room as Thor roared in anger, chasing them. Steve and Clint could only stare after them.
Five minutes later, Thor reentered the kitchen. "I now understand how you are blue," he commented sadly, his face covered in the angry boils and his skin dyed the same shade of blue as Clint and Steve's.
"Blaine," Tony sighed as Bruce sat the boys down on the living room couch. The rest of the male Avengers stood behind the two scientists glowering at the boys. The evidence for their ire was blatantly stated in their blue skin.
"It wasn't us," Blaine protested quickly. Tony gave him a skeptical look, clearly not buying it.
"Okay, Uncle Clint and Uncle Steve were us," Blaine conceded to which Sebastian groaned.
"You were suppose to deny it!" Sebastian hissed to his friend.
"B-But, Uncle Thor brought that upon himself," Blaine hurriedly amended.
"Which part?" Bruce demanded.
"The blue skin."
"How?" Now Tony was curious.
Sebastian sighed knowing they couldn't deny responsibility any longer. "JARVIS misinterpreted the lighting sparks he was giving off as another biological attack and since we modified the outcome of his response for our prank, Uncle Thor kind of walked into it," he supplied.
"And the boils?" Bruce asked.
"That's Uncle Clint's fault," Blaine stated decisively. Sebastian nodded emphatically in agreement. The two scientists turned to Hawk with raised eyebrows.
"What?" the man stated, glaring back. "I asked them what they were doing and told them to show me."
"And we warned you it wasn't a good idea. We hadn't tested that compound yet, although the field research has indicated we need to tweak the formula since it was suppose to wear off after seventy-two hours," Sebastian explained. He glanced at Blaine. "Do you think the method of implementation, as direct contact with the chemical, caused the lasting effect?"
Blaine shook his head. "No. Method of dispersal should have no impact on the formula. I think it might be the dormant virus we used as the trigger."
"Hmm, that's possible," Sebastian agreed. "We'll need further lab tests and maybe another field test or two to ensure the proper outcome. What?" he demanded, feeling the eyes of the men around him.
Thor and Hawk had thunderous expressions on their faces, and Steve sighed. "What did I tell you about biological weapons?" he asked the boys.
"Have you thought about trying a different method of dispersal which would introduce a different required virus?" Bruce asked, clearly intrigued by the discussion.
"You should try water or direct injection," Tony supplied, thinking. "Air not reliable for biological weapons."
Steve threw up his hands as the two boys followed their fathers from the room to the lab, the discussion becoming more adamant "I give up," he muttered, turning apologetically to the two men.
"You try your best, Steve," Clint stated, throwing himself on the couch.
"Initiating sequence Romeo-Five-Three-Omega," JARVIS suddenly intoned. The doors to the living room slammed shut and suddenly the room was filled with purple gas. The three men coughed as it dispersed just as suddenly as it appeared. They faced each other, their hair all died bright pink.
Suddenly, two voice echoed throughout the mansion angrily.
"BLAINE ANTHONY ANDERSON STARK! I'M GONNA KILL YOU!"
"SEBASTIAN BRUCE PHILLIP SMYTHE BANNER! WHEN I GET MY HANDS ON YOU!"
Fin