Hey guys, thanks for the reviews! I noticed that a lot of people seem to think that in this story Phineas is a bit, well, Doofenshmirtzy? That's kind of true, but before I wrote this, I thought that Phineas had never really experienced love and, even for super nice people, the reaction to it isn't always the best. I also wanted to get into Phineas' thoughts for a while, since a lot of the fanfics I've been seeing have him going straight to being lovey-dovey with Isabella. We will get there thought, since this IS a Phinabella fic! Anyway, just thought I'd share my thoughts; again thanks for the reviews! =)

Disclaimer: I do not own Phineas and Ferb (if I did, Phineas and Isabella would have kissed a lot sooner =P)

"What?" Ferb exclaimed, his voice rising slightly above his usual quietness. "Phineas, why ever would you want to destroy love?"

"I just…" Phineas sighed. "I won't destroy love for everyone or anything, but I think maybe I'm just not meant to have feelings like this. I can't even talk to my best friend anymore, without getting nervous and unconsciously doing irrational things! She wouldn't ever be interested in me anyway, so why put her through all this?"

Ferb furrowed his brow, but made no other movements as he tried to process and understand his brother's point of view. He could understand Phineas' dilemma; the two boys got pretty much anything they wanted by relying on, or challenging, the laws of physics. Just by doing the things that interested them, they had come to be loved by most everyone in Danville. But this was different. Phineas had never felt the need for anyone's approval, so the sudden change would be a huge blow to him.

However much it was hurting Phineas in the present, Ferb couldn't let his brother destroy his own feelings. Especially when he knew that Isabella had been waiting years for Phineas to finally realize and accept hers. Ferb resolved to get his brother and neighbor together, no matter what; assuming Phineas' emotions didn't kill him in the process.

"Maybe you should give love a shot," Ferb suggested, his speech returning to normal. When Phineas still looked skeptical, he added, "Sure it'll take some getting used to, but it's not like any of our projects this summer were that easy, right?"

Phineas sighed again and Ferb noted that Phineas had probably sighed more that day than he ever had in his whole life. "Ferb, I know you're trying to help, but what if it gets worse? What if I'm building something, but I screw it up and hurt someone all because I can't stop thinking about Isabella?"

Ferb could see that no more attempts at persuading would work for the time being, so he stood up and flexed his hands. "Maybe a little building will help you think more clearly. We still have to build that martial arts studio, you know."

"Alright, I'll try," Phineas reluctantly agreed. "I guess, just let me know if I start acting funny…"

Ferb nodded before edging his lips into a small grin. "Just make sure I don't do more talking then you or they'll know something's up."

At last afternoon came and the Fireside Girls gathered in the Flynn-Fletchers' backyard, each dressed in an array of black that made them look like the Fireside Ninjas. When Isabella entered the first thing that she noticed was, of course, Phineas. The second was that the backyard was completely normal other than a small, newly constructed shack.

"Uh, Phineas?" Isabella asked, cocking her head to one side. "Where's the studio?" She noticed that Ferb was nowhere in sight, but didn't mention it.

Phineas hesitated a moment and Isabella thought she saw a shadow of doubt in his eyes, but it vanished too quickly for her to tell. And then the old Phineas was back.

"Come, students," he said in a mystical voice, "the master is waiting for you."

Phineas led the girls into the shack, where he pressed a small button, the same color as his hair. The floor of the shack dropped out from under them and they fell into the blackness below. As was usual for Phineas and Ferb, they landed on a platform that was soft, painless, and somewhat resembled a trampoline.

When they were all on solid ground, the Fireside girls looked around to see that they were in an underground tunnel, lit by a single torch.

"How can we do martial arts in here?" Isabella asked, wide-eyed.

Phineas assumed what looked like a meditating position and then began to relay his instructions. "You will travel down this tunnel in order to reach the master. On your way, you will meet several challenges: some big, some small, but most of them difficult. More will be explained when you reach the master." And with that Phineas vanished into the darkness as if he were a ninja himself.

Back outside, Phineas breathed a sigh of relief. Isabella had looked so cute in her jet-black outfit that he'd nearly choked up and panicked. He needed to solve this before someone else noticed and started asking questions. Phineas still thought that it might be easier to delete his feelings than to try controlling them, but then he remembered what Candace had told him and Ferb about mothering; that it can't be done with machines.

Then Phineas knew whom he needed to talk to help get him out of this mess: Candace! Candace is the master of love! Phineas thought, as he hurried towards the house. I mean, she got herself a boyfriend, right?