This is my second fanfic and sequel to 'There's no such thing as just an ordinary day' so if you've clicked onto this, I'd recommend that you read my first fanfic before reading this one. As always, please feel free to leave a review if you've enjoyed this story.

(The Prologue takes place at the end of the day where my first fanfic finished. The rest of the story will take place a few days later as stated in the summary. Rated T for later chapters.)

Disclaimer: Phineas & Ferb belongs to Dan Povenmire, Jeff 'Swampy' Marsh and Disney.

It was the end of the day and Isabella made her way home just as she did everyday but this time, something was different. Earlier, Phineas had confessed his love for her after retrieving a memory that she could not remember. This was the happiest day of her life. She wouldn't have to wait her whole life to be with him anymore. But there was something that was still bothering her. When they went inside all they did was talk about their feelings but whenever she asked about his memory, he would avoid the question and say that it didn't matter. Sure it didn't matter to him, but she wanted to know. In fact, she needed to know. As she decided to run back home, Phineas was watching her, unable to take his eyes off of her. She just looked so beautiful at sunset. As she moved out of his view, he moved off his windowsill and lay down on his bed, looking up at the ceiling. Soon after, Ferb entered the room. Phineas looked up at him and Ferb raised an eyebrow as if to say 'Well?'

"If you want to know how it went, it went better than I could imagine" he said beginning to slip into a daydream. 'It must have gone extremely well if it was beyond Phineas' imagination' Ferb thought.

"What did you find?" Ferb replied as calm as ever.

"What do you mean?" Ferb pointed out into the backyard where their invention had disappeared a few minutes earlier. "Oh, from the machine. Well, it's the weirdest thing. There was like a blip in my memories. A small part where there was nothing." Ferb knew what Phineas was on about. Even he couldn't remember that day of summer but he had gotten past it and moved on with his life. "I had to slow down my mind to see these memories. They were moving at supersonic speeds or something. And I saw some weird things. Say, Ferb?" Ferb who had been listening while getting dressed for bed, turned around to look at him. "Do you remember riding our mechanical bulls downtown?"

"If you're talking about that day, I think you know my answer."

"Oh, well there was other stuff too like, Baljeet was fighting robots in The Beak suit." Ferb, again, raised his eyebrow to this, believing that Baljeet would take a strategic role in a battle rather than a combat role. "Then I found probably the most important moment." Phineas now had Ferb's total attention. "She kissed me. She kissed me Ferb! And I forgot. How could I forget?" Ferb got up from his bed and sat next to Phineas and put an arm around him.

"People often forget things that threaten to hurt them."

"But it was a happy moment. I know it was. Wait… wait it was… I…" a tear started to form in his eye and so Ferb pulled him into a hug. Phineas then glanced out into the dark of the night as he found himself questioning the moment that he had chosen to embrace. "I don't know what it was."

Pinky began to bark uncontrollably as Isabella reached the house. But she was in no mood for her dog. She burst through the door and ran straight into her room. She immediately pulled her notebook out from under her pillow and sat down at her desk. She skipped the first few pages which were filled with Phineas land fantasies and made her way to a blank page in the middle of the book. Without hesitation, she began to write down everything that they had done every summer. She started from when Phineas and Ferb built their rollercoaster, thinking that if she wrote down everything, it would help her to remember their first kiss.

It was 3 a.m. and Phineas and Ferb were sleeping silently with Perry, who had gotten back from thwarting Doofenshmirtz again a few hours ago. Ferb had told Phineas not to dwell on his feelings now and that they would sort them out in the morning. However while they were sleeping, someone was still dealing with her feelings. Isabella was still sat at her desk and hadn't moved for the past half an hour. She couldn't understand what was in front of her. 'Why? Why, why, why? Why would I do that? When did I do that?' She was staring at her notebook. It had taken her ten minutes before she realised what she had done. She kept going through each of her pages to make sure…. Well… To make sure she hadn't done this before. She read through all of Phineas and Ferb's inventions, each one taking up an eighth of the page. She read until she stopped above a black line. In fact, the last half of the page was completely covered in ink. She hadn't spilled any. I was more like she had coloured it in. She flipped the page to see the rest of Phineas and Ferb's inventions on the other side. 'Why?' She knew it had something to do with the day she couldn't remember. It was one thing not to remember something; it was another to have something stopping you from remembering. This scared her the most. She couldn't even imagine what happened that day. Whenever her mind tried to focus on that day, something would always force her way into her mind, distracting her from remembering. The more she tried to remember, the more scared she got. She tried writing down what could have happened that day and every time something would happen to her; from her hand trembling and refusing to move, to coughing uncontrollably. After 40 minutes, she had ended up on her bed, curled up under the sheets, tears streaming down her eyes like waterfalls and her knees to her chest, terrified of what she would do if her mind wondered.