A/N: Thank you, Dreadwing216, my friend, Sabrina06 and Anonymou7155 for your reviews! :) And also Sabrina06 for the idea. :)
ATTENTION, PLEASE! I'VE GOT SOMETHING IMPORTANT!
This story is dedicated mainly to my No. 1 Reader (as I promised :*), but also to my friend and my sister. :) I would like to thank them for their great support... :)
Now to the story - it's my own idea, read and (hopefully) enjoy!
I don't own Phineas and Ferb.

It was early Saturday evening and Isabella was walking towards her crush's house. For the second time on that day, actually. She was coming back for the books that she had forgotten to take during her previous visit. She got there and just walked in like she always did.

"Hi, Isabella!" Linda greeted her.

"Good evening, Mrs. Flynn-Fletcher!" she replied. "I've just come back for my books. I think I left them in Phineas' room. Is he there?"

"Yes, he should be there with Amanda," replied Linda.

Isabella raised her eyebrow, but quickly remembered who Amanda was. She was Candace and Jeremy's little daughter and Phineas and Ferb's niece.

"Thank you!" she said and went upstairs. She was just about to enter his room and say her usual "What'cha doooin'?", but she suddenly heard... singing. Phineas was singing and playing the guitar. She stood there, delighted, when she decided to come in as quietly as possible. Phineas was sitting on his bed and singing.

Amanda, who was lying next to Phineas on his bed, giggled cheerfully. He took her into his arms and kissed her tiny forehead a couple of times.

Isabella thought to herself, He would be such a perfect father.

She blushed a bit as she thought that. She couldn't help sighing dreamily.

That's when he finally noticed her.

"Oh, hi, Isabella!" he said, smiling. "You haven't met Amanda yet, have you?"

"No, I haven't had the pleasure," she said as she laughed and walked over to them. "Can I hold her?"

"Sure," he replied and handed her his niece. She carefully held her in her arms and smiled warmly at this adorable little wonder.

"She's so lovely," she whispered.

"Yes, yes she is," said Phineas staring at the two of his most beloved... Wait, what? He was startled by his own thoughts.

However, they were true.

"Thanks," said Isabella, giving the child back to him. "You know, I almost forgot why I came here. I had forgotten some books here."

"Oh, yeah, I noticed that and I even wanted to give them back to you, but I had to look after Amanda," he put Amanda on his bed, stood up, took her books from his desk and handed them to her. "There you go... Izzy."

And it was too much for her. First, listening to him singing and playing the guitar (the guitar!), then seeing him holding a baby in his arms (he looked so amazing) and eventually this nickname...

"I'm sorry, Phineas, but if I don't do this right now, I'll just go crazy!" she exclaimed and passionately kissed him, cupping his face. Phineas was extremely surprised, yet stunned by her sudden decision, but Isabella was even more shocked when she felt that Phineas started kissing her back. They both felt like everything around them didn't exist. Only them, and nothing more.

Then Candace walked into the room. "So, Phineas, how was Aman... aw, come on!" she said when she saw them. "Not in front of my child!"

They didn't even seem to hear her.

I hope you liked it!
Tell me what do you think and stay tuned!
ElleFreak is out, peace!