A/N: A post season finale episode! I know, I know, they're like a dime a dozen now, but we thought we'd give it a shot. This is a coauthored work and we absolutely love reviews. So be kind, rewind, and review : )

Post season finale: Peter is brought back into existence, but no one remembers him and he doesn't remember anyone; including himself.

Chapter 1: Mass Confusion

Olivia was confused. And though that happened often in her line of work, this was a new level. Before her sat a man, a very handsome one, that was in all of her own reports for cases for the last three years and supposed dead son of the mad scientist she worked with, Walter Bishop. She didn't remember him in the slightest though. All those reports she had written up once the Fringe Division had started up included him in some capacity, whether he was saving her ass or she was saving his, coming up with the scientific mumbo jumbo that explained away the cases they saw, or even helping her interview suspects. So why did she not recognize him and why didn't he have any real people memories either.

"Who are you?" Olivia asked for the millionth time, pacing the length of the small interrogation room.

He gave her a very sarcastic look that said 'You already asked and if you didn't believe me we wouldn't be here still'.

"Fine," Olivia nearly huffed. "Then what do you remember?"

Peter breathed a long sigh before massaging the bridge of his nose. "Just vague stuff. I remember Walter is my father but no real memories that aren't fuzzy and I know that you seem familiar though I'm not sure why."

"According to the reports we were partners," Olivia said. "You helped translate some of the ideas Walter came up with in the lab and helped me apply them to a case."

"I do remember some crazy science stuff," Peter looked almost hopeful, but then realized nothing else was coming to mind and the buzz died. "Look… I know how frustrating this is. I mean my entire life has been erased. I remember what I've learned from people, books, experience pretty well, but people - I just don't know anyone."

Olivia frowned and finally took a seat before him. "My reports stop including you shortly before the bridge between universes was created. I'm assuming something happened while the bridge was created that made you… disappear for awhile."

"Universes plural? Bridge?" Peter looked even more confused and lost and Olivia felt a pang of guilt for grilling him so hard earlier. He really was even more lost and confused than the rest of them.

"I'm sorry," Olivia sighed. "This is a lot to take in. Maybe I can take you to Walter's and you can get some rest. I'm sure you're exhausted."

Peter looked like he wanted to argue that he'd rather learn more about what happened, but he finally nodded his agreement. Olivia escorted him to her SUV and they piled in. Five minutes on the road and Olivia couldn't watch him look miserable for a second longer.

"Walter thinks the memories will come back, but they'll take some time," Olivia said. "All of the physical reminders that you existed are already there and we just have to wait for the memories to come back. He says there's family pictures with you in them appearing around the house."

Peter didn't even spare her a look.

"I'm sorry this happened," Olivia said softly, really feeling it down to her toes. Whatever had happened, this man didn't deserve it.

"Why are you sorry? It's not your fault I can't remember people," Peter said flatly, working hard to keep the emotion out of his voice. "Am I married? Do I have children? Do I live with someone?" With each question his voice grew more angry and panicked.

"Peter," Olivia settled a hand on his forearm to calm him. "We'll figure it all out. I promise."

He turned gave her the most intense look she'd ever seen coming from one person and it nearly sent a shiver down her spine. She had a moment to wonder if she'd promised too much when she pulled into the driveway and quickly escaped the vehicle. Olivia could hear him follow behind her and she fought the urge to turn and look at him again. Something about him made her want to stare at him for hours. Fumbling for the house key on her set she quickly found the key with a gold star that took up the entire base. It had been Walter's idea of a gift when he'd thought she looked like a person who liked stars. Once the door was open she casually entered the house and noticed right away the changes Walter had spoken of.

The pictures on the wall that had just been Walter and his late wife or Olivia and Astrid now included a third person. Peter was in almost every picture she saw from her place in the entrance. There was even one where she had been caught feeding him a spoonful of ice cream with a teasing smile and him grinning like an idiot. Her heart stumbled in her chest as she took in their expressions. It couldn't be right though because she wasn't stupid enough to pull another John-moment. She would not fall for another partner. Maybe they were just really close friends.

"This is sooooo bizarre!" Peter said in awe as he walked around to each picture. "It's like watching a movie of someone else's life."

Olivia only nodded numbly, taking in all the other differences. There were a few more coats on the rack, the living room was a little messier, several more movies were on the shelf, and even the air around them smelled a little different. When she turned to look at him again he was stuck on the picture of them.

"Do you think we were seeing each other?" Peter asked carefully, not daring to look at her as he asked.

"No," Olivia answered quickly. "I don't date partners."

"Oh," Peter said, stepping back from the picture and moving. "Has this place changed much since before I reappeared?"

"Yes," Olivia answered, not really sure how to put it into words.

Peter wondered around the house and Olivia trailed behind, taking in all the changed scenes. The book shelf seemed to be especially crammed with books, a cabinet with alcohol in it that she knew Walter never had, a few more pairs of shoes in random places, and a few more homey touches to just name a few. She followed him up the stairs, cautious to keep her distance so that he had his space to explore, but not wanting to lose sight of him. They each poked their heads into the first bedroom to see what was clearly Walter's bedroom with the sweaters scattered everywhere and random food items in places they shouldn't be. The next room must have been Peter's because she didn't remember Walter owning any of the things in the room. There was a messy desk with a couple picture frames on it and a random collection of circuitry and robotic type equipment in corners of the room. Bits of clothing were scattered around the room; a pair of jeans over the back of a chair, a t-shirt by the bed on the floor. Olivia slipped past Peter and walked the perimeter of the room, eyeing everything carefully to garner knowledge about her imaginary partner. She was just passing the nightstand beside the bed when she saw a pair of silky black panties that definitely did not belong to a man, but looked oddly familiar. With a single digit she lifted the panties up and turned to Peter.

"Well you were definitely getting some," Olivia joked half heartedly.

Peter looked up and actually blushed, looking away quickly.

"She appears to be about a size six or four with excellent taste in undergarment fashion," Olivia couldn't help adding her analysis out loud that only served for him to swipe them away from her grasp and toss them into a basket.

"Well whoever she is she won't remember me so it doesn't matter anyways," Peter sighed.

Olivia frowned and nodded, knowing he was right and feeling terrible for joking like she did. "I'm sorry, Peter."

"Don't be," Peter said roughly. "Judging by the lack of ring and more feminine items I would say I wasn't married and that's a good sign."

"Would it be so bad?" Olivia asked. "To be married, I mean."

"Well I'm not exactly marriage material and that would be one more person I couldn't remember that I should." Peter gave a self depreciating smirk. "Besides, whoever this poor girl is is better off without me in her life."

Olivia frowned at his supposed joke. He really didn't seem that bad to her. A bit dry and sarcastic, but hardly horrible.

"You're probably going to want some time alone, I'm sure," Olivia said, trying to find an escape from the awkwardness.

"I guess," Peter mumbled, clearly distracted by the room around him. "Will you be by tomorrow sometime?"

"Yeah," Olivia said, thinking back to her schedule. "I sometimes bring Walter some take out in the evening. Got a food preference?"

"Chinese?" Peter said it as more of a question. "I don't care what exactly."

"Okay," Olivia nodded, backing up to the door. "I'll see you tomorrow then."

She didn't wait for his reply and quickly exited the house.