Last chapter! :)

I do not own P&F

Ferb never bothered looking back behind him. He held on tightly to Phineas's hand and dodged any leftover traps that hadn't sprung yet. Another rumble from the building sent them flying to the ground. Ferb coughed when all of this dust filled up the area they were in. He then heard the sound of something crumbling and knew that the building was going to collapse any minute. He reached back for Phineas's hand and went to pull him up, when he realized Phineas wasn't getting up with him. Ferb turned around and gasped when he saw Phineas's lower body trapped underneath part of the wall.

Phineas grunted as he attempted to push himself up and out, but the wall wouldn't budge. He looked up desperately at Ferb,

"Get out of here Ferb! Go get some help!"

There wasn't enough time for that. Ferb ran over to his brother and began lifting up the heavy wall. He shut his eyes up tight and continued to lift it inch by inch. Phineas wiggled and pushed himself out from underneath the wall. As soon as he was safely out of the way, Ferb dropped the wall down and huffed out.

Phineas moved his foot and winced, "Ferb my ankle… I think it's twisted or something."

Ferb frowned and walked over to him. In one smooth move, he lifted Phineas up bridal style and began running again. Phineas yelped in surprise and clung onto his brother's shoulder and neck. He looked back behind them and watched as the walls around them exploded and crumble to the ground.

Just when things couldn't get any worse… it did. Small daggers started flying towards them.

Phineas yelled, "Ferb! Flying darts! We need to change our path now!"

Ferb bit his lip but kept running. He could feel them traveling downhill, so he knew that they were going the right way. He suddenly winced when he felt a dagger scrape across his arm. He huffed and made a sudden left turn… that led straight to the bottomless pit.

"What's happening? Why's the building falling apart?" Candace asked,

Baljeet tapped his chin, "It may have to do with the fact that there's a self destruct button in the building. If the boys are stuck in there, they may have decided it best to blow it up and hope that they'll be able to make it out before the whole thing blows into oblivion."

Candace's mouth nearly dropped, "Why on earth would they do that?"

Buford shrugged, "Maybe it was an accident?"

"Accident or not, my brothers are still in there! I have to get them out!"

"But how?" Isabella asked,

Candace went to answer, when she realized that she didn't have the answer to that question.

Ferb silently cursed himself for not remembering to look before he leaps. Now he and Phineas were truly doomed. Phineas and him pulled off their move from earlier and were now grasping each other's hands while keeping their feet up against the walls of the pit. Phineas tried not to cry out as his ankle was now in pure agony. He had to put weight on it in order to stop sliding down.

He looked down and tried to see if there was some sort of bottom to the bottomless pit. He looked back up at Ferb,

"Ferb… if we ever get out of this alive, let's promise to never EVER build something like this again."

Ferb nodded in agreement and looked around for any hidden doors. He soon spotted a knob sticking out right below them. He motioned to Phineas with his eyes and looked back down. Phineas looked to where Ferb was motioning to and smiled slightly.

"That looks promising… but how are we going to get down with out falling again?"

Ferb looked up at his brother, "Follow my moves…"

Ferb moved his foot down slightly, so Phineas moved his down as well. Ferb moved his other foot down and Phineas did the same. They both shimmied down the walls until the reached the knob. Ferb carefully used his foot and opened up the door. He swung Phineas in first and followed in after him. Phineas cried out as his accidently landed on his ankle, and Ferb shot him an apologetic look.

Phineas shook his head, "It's fine, let's just go."

Ferb nodded and scooped his brother up into his arms. He ran again for a while and saw what they've been looking for this entire time… the exit.

Ferb placed Phineas carefully down on the ground and grabbed the shovel they had set up to dig their way out. Ferb jammed up at the dirt and started digging up. Phineas stood shakily and hobbled his way over to Ferb.

"Here, let me help…"

Phineas went to grab another shovel, but Ferb shook his head.

"Look I'm helping, alright? We'll get out of here faster if I help…"

Ferb just sighed and continued jabbing the dirt away.

Candace held her breath as the building started self-destructing. The top of it was already diminished and was growing smaller by each passing second.

Isabella gulped, "I sure do hope the boys weren't up there…"

Candace nodded slowly and tried to think positive thoughts. Buford saw something moving a ways off and pointed,

"Hey look over there… the ground is moving."

The four kids turned and watched as two shovels came popping up. Ferb hopped up out of the hole first and reached down to pull Phineas up. Candace shrieked and went running over to her brothers. She snatched both of them up into a tight hug and started crying,

"Are you two alright? Oh you don't know how worried I was…" she pulled back and looked sternly at them, "don't you two ever scare me like that again!" then she sobbed and pulled them back into a hug.

Phineas chuckled, "We're sorry Candace… and yeah, I think we're just fine. Except my ankle is twisted and Ferb is cut up from some of the flying daggers."

Candace pulled back again, "Flying daggers?"

Just then, the building finished up self destructing itself. Everyone turned to face what was left of the tower and watched as the small dust particles blew away.

Buford whistled, "Wow… looks like you two got out just in time."

Phineas giggled nervously, "Yeah that was close… man, that wasn't nearly as fun as I thought it would be. Ferb and I are never EVER going to make something like that again."

Candace sighed, "Glad to hear it… but we still need to explain all your scrapes and bruises to mom and dad, and I'll doubt they'll believe the whole tower story."

As if on que, their parents pulled in the driveway. Isabella, Baljeet and Buford said something about their mom's calling them and quickly left.

Lawrence and Linda waved to the passing kids before entering the backyard. Linda quickly gasped when she saw the boys,

"What the heck happened to you two? Why are you guys so beat up?"

Phineas went to walk over to his mom, but yelped when he put too much pressure on his ankle. Ferb was by his side and helped balance him. Phineas shot him a smile before looking up at his mom,

"Hey mom… uh, how was your day?"

"Phineas what happened here? Why are you limping and soaking wet?"

"Oh, I uh… was cleaning the outside of the house and… climbed up on the roof to clean it better and… tripped and fell…"

Ferb groaned at his brother's lie. Sure he did kind of trip, but seriously? Would their parents even believe the roof part of the story?

Lawrence looked down at Ferb, "And what about you? Why are your arms all cut up?"

Ferb looked down at where some of the daggers caught him and shrugged, "I um… was playing with knives…"

"You were WHAT?"

Linda pointed to the yard, "And this… why does the grass look like it got burned?"

Candace quickly stood, "I was… playing with dad's bow torch…"

Wow, Phineas thought, the three of us are TERRIBLE at lying… yes, mom and dad seem to be buying all of the stories…

Lawrence and Linda looked at each other before looking back at their kids.

"So were you all involved with… well, everything? The blowtorch? The knives? The roof?"

All three nodded their heads.

Lawrence sighed, "Okay… let's get you three all cleaned and patched up, then we're all going to sit down together and have a long talk about all of this… a VERY long talk."

All three kids nodded again and started walking into the house. Phineas kept his weight off his injured foot, while Ferb helped them into the house. They turned their heads when they heard something walk up behind them.

"Krrrkrrr…"

Phineas chuckled, "Oh there you are Perry… man, you really missed a lot today."

As they walked inside, Perry looked around the yard. Not seeing anything, he shrugs and follows his owners inside.

Bah! Not my best... but I was stuck for an ending. Okay and I will be doing the other 'what if?' story. Hopefully the first chapter will be up tomorrow or the day after. :) Thanks so much for reading! Hope the end didn't suck too too much... Review?