When Pepper returned to the hellicarrier the next day, the medical wing was in complete and utter chaos.

The Avenger's weren't quite getting control of 'filter' aspect of their psychic link and were hearing every last though of the other members of the team.
Bruce had run off and 'hulked out' in his containment cell while Natasha had secluded herself in the corner of the medical bay; as far away from everyone else as possible, she sat on the floor clutching her head in her hands. Clint and Thor were arguing, literally screaming at each other while Tony was desperately trying to take notes on anything of interest or blackmail worth he heard and Steve was trying to follow the doctors instructions, and focus on his own thoughts, block out the others and only allow certain bit of information through. They'd been at it for hours now and no one was making any progress.

When Pepper entered through the security doors it was just in time to see Natasha throw a beaker of liquid at one of the doctors and yell at them to stay away from her. She returned to her crouched position on the floor and closed her eyes.
Pepper marched across the room, grabbed Clint by the collar and dragged him away from Thor; "Go help your girlfriend" she told him sternly, practically throwing him in Natasha's direction. On her way back across the room she confiscated Tony's pen and paper before ordering Thor to sit down. Turning to Dr Hart she asked "Where the hell is Fury?"

Pepper would have been the most terrifying woman he'd ever met, if he hadn't just been threatened by the Black Widow that she was going to 'bury him alive outside her house so she could hear him screaming'

He pointed with a shaking hand towards the interview room they'd set aside to assess the Avengers individual progress (should they actually ever make any).

Steve took the needle from Dr. Hart who was currently trying to take blood from him and handed it over to one of his assistants who wasn't quaking like a leaf.
Dr. Hart clearly didn't cope well with strong minded, confident women; especially when said women were angry.

Pepper threw open the door and interrupted the meeting currently going on between Fury, Hill and Coulson;

"Mind telling me what's going in here?" she asked, hands on hips and eyebrows raised.

Fury gazed past her to the room of Avengers where Thor was now hitting his head against the wall and the two master assassins were sat in the corner on the floor.

"Come in Miss Potts"

"It's chaos out there"

"Yes, we had noticed" Fury told her as she joined them at the conference table

"What the hell happened? I thought this had been tested?"

"It has, but on no more than two agents at a time!" Hill answered angrily, glaring at her boss

"There was no reason to think this would be any different, however the Avenger's are currently being overwhelmed with the others thoughts and voices in their head. They're not coping to well, we didn't plan for this. We didn't think it would happed" ...

Steve was beginning to make a little progress in blocking out the others, but no one else was.
"I beg of you all, please just be quiet!" Thor shouted. The incessant chatter and noise in his head was driving him insane.
The thoughts Tony had been so interested in earlier were blurring into constant noise, his head pounded and he'd lay his head on his desk and closed his eyes in an attempt to block them out.
Natasha was curled up in Clint's lap, desperately trying to focus on reality, her reality. There was too much; too much in her head and it hurt.
Clint held Natasha tightly, all his attention placed on her slightly too fast heartbeat as he tried to drown out the chatter.
The Hulk was not happy, he was angry with the noises in his head. And nothing he did, no matter how hard he hit or how loud he shouted, it wouldn't go away.

XXX

Dr Hart had joined Fury, Hill, Coulson and Pepper in the conference room to discuss the next step

"Would separating them help?" Pepper asked

"No, the point of the drug is to connect them when they're in the field, it's supposed to work across distance. Perhaps a staggered implantation should have been implemented in order to allow them time to adjust..." he thought out loud

"Oh you think?!" Hill responded sarcastically, causing Dr Hart to cower slightly

"What if we sedated them, four of them at a time and they worked on it in pairs?"

"You want us to knock unconscious four of our team of superheroes at a time?"

"Well, let's be honest they're of no use to us as they are sir"

"Okay fine, but who's going to knock out The Hulk?"

Sedatives were administered to Thor, Clint, Natasha and The Hulk (they gassed the containment cell, rather than trying to approach him with a needle), allowing the team of doctors and scientists to work with the two who'd kept the most control when 'Project Decoy' had first been activated.

Steve and Tony sat opposite each other at the table while they worked on controlling their new skill. Occasionally Tony would smirk, or Steve could sigh at thought's they'd heard from the other but after a few hours work it seemed they'd mastered it.

"Who next?" Dr. Hart referred the question to director Fury, who looked over the three sleeping Avengers in the medical bay and considered the sleeping Hulk down the hall...

"Romanov and Barton" he answered a second later

"Sir, do you think it's such a good idea?" Hill asked

"Why not?"

"The two of them are in a relationship, being inside each others heads might do more harm than good" Pepper answered, breaking the unspoken truth. Everyone at Shield knew they were a couple, but no one voiced it out loud; everyone pretended, including themselves; Fury turned a blind eye and no one interfered. That was just how it was.

"Okay, Barton and Thor then"

It took them slightly longer than Steve and Tony, mainly because the argument from earlier re-erupted and the better half of an hour was spend shouting about Loki. They eventually (after a little mediation) settled the argument and set to work with Tony and Steve to control their new ability.

It was decided they'd wake Natasha next, and the four others worked hard to block her thoughts from their mind and block their thoughts from hers, she grasped the concept quickly and was soon able to control it herself. She breathed a sigh of relief that her head was her own space once again.

Then it was time to wake the Hulk. The excessive amount of sedative used to bring him down took a while to wear off, and then Tony worked with him alone to begin with. He managed to stress the importance of needing to speak to Bruce, and eventually the Hulk relented and shrunk back down to his former self.
Bruce managed to get control of it faster than any of the others, and finally the six of them allowed to leave the hellicarrier to return to Avengers Tower.