Phineas's alarm clock wakes him up and greets him happy birthday. Phineas asks Ferb what they will do today but he notices that Ferb's bed is empty, with a note on it. Phineas reads the note, which tells him that he will go on a scavenger hunt. Phineas then wonders where Ferb is. Ferb, who is in the backyard, dons Perry's fedora and exits the backyard to go to Irving's house. Candace is talking to Stacy about buying Phineas a gift, saying that she doesn't know what to get a boy who builds everything. She then sees Ferb running into Irving's house. Once inside, Ferb, Isabella, Irving, Buford, and Baljeet discuss what they will do for Phineas's birthday. They then decide to create a video compilation of his greatest moments. Candace watches them and sees Isabella, Baljeet, and Buford leave, each holding a disc. Candace decides to bust the boys and makes her way to Isabella's house. Back at the Flynn-Fletcher home, Phineas is reading his first clue: "This birthday excursion will take you afar, you'll find your next clue where the 2x4s are." Phineas starts thinking, but realizes Perry has disappeared.

Perry walks into his lair and sits down. Major Monogram and Carl are on camera, and Monogram tells Perry that his entrances are a little "lackluster" lately, and that he expects more from Perry. He then tells Carl to roll some footage of Perry's more "bizarre" entrances, including swimming into his lair while dodging a laser shark, a dusty tree slide, and a giant Perry lifting the roof off of his lair in order to get in. Perry then walks out. Monogram says to Carl that they should wait a few days before talking to Perry about his exits.

At Isabella's, Candace walks into Isabella's room, where she is editing some video she got from Irving earlier. Candace presses play, and then a short video of Phineas saying "We'll - Be - Together - Forever - Isabella!" Candace wonders if she has anything more unusual and Isabella shows her another video of the Fireside Girls re-enacting a parody of Howl. Candace asks her if she has any footage of Phineas's inventions, but Isabella states she hasn't. Candace then says that makes her useless, and goes to Baljeet's, leaving Isabella to carry on editing, including Phineas saying "Isabella-will-you-marry-me?".

On camera at Doofenshmirtz Evil Incorporated, Perry kicks Dr. Doofenshmirtz's door open and runs in, only to be trapped inside a TV. Doofenshmirtz turns and faces Perry, and explains that he saw him coming on his video surveillance system. He then says to Perry: "If I had a nickel for every time I trapped you..." He then played a series of videos displaying Perry being trapped. Each time he got trapped in the video, the number of cents in the top right would increase by 5. At the end of the video, Doofenshmirtz had $1.10, and was expecting more, although he said he could buy a candy bar. He then tells Perry that he has figured out why his schemes fail. He plays a video and then asks Perry if he can see what they all have in common. At the end, he says that they fail because they have inator in the name. He says that is why he named his newest creation the Video-Beam-Hijack-non-inator. He added non because non means not, so it's a not inator, which means it can't fail.

Back with Candace, she receives a call from her Mom asking where she is, as she promised to help ice the cake after she got Phineas a gift. Candace said she got a little sidetracked, saying she would show her something that she won't believe. Linda replied with: "If I had a nickel for every time I heard that." A clip then played, showing each time Candace tried to bust the boys, and like Doofenshmirtz's clip, each time a number went up by five cents. Linda ended up with 75 cents and said she could buy a candy bar.

Back with Phineas, he was outside the Tri-State Plank & Board, where some of the boys' best structures were born. A construction lady walks up to Phineas upon hearing his voice, and greets him Happy Birthday. Phineas asks if she saw Ferb, but she said she had only seen a guy wearing a bird-themed super-suit shooting eggs from his wrists, and she then realizes that it was Ferb. She then asked Phineas if he was a little young to... but Phineas then interrupted by saying: "Boy, if I had a nickel for every time I heard that." And then, another "nickel" clip played, with people asking Phineas if he was a little too young to be doing whatever he was doing. At the end, he ended up with 60 cents. The construction lady asks if she was meant to see something and Phineas said it was a clip show. They both then walked over to where Ferb had been, and there was a giant slushy dog on a stick, covered in egg yolk. Phineas takes it for a visual clue.

At Baljeet's house, Candace barges in and demands to see the video that Baljeet had. Baljeet tries to stop her, but ends up pressing play. The video then playes, showing Candace when she was hallucinating, a giant baby, a robotic version of Linda controlled by a small alien, Professor Poofenplotz's Me-Mobile, some weird creatures and Phineas and Ferb running around a hotel, one of Candace's dreams, Linda and Lawrence acting insane, and the Badink-a-dinks. Candace wondered out loud what the heck that was, and Baljeet said, "That is what I said! Sure, give the weird stuff to Baljeet, who cares if it does not work out of context?!" and that was all the video he had. Candace then began to make her way to Buford's house. Baljeet said that he needed better clips, and the screen then faded to black.

Back with Doofenshmirtz, he explains that people are making a twelve part biography mini-series about his brother, Roger, that runs all day long - nothing but propaganda. He invented the Video-Beam-Hijack-non-inator, so he could pre-empt the biography so his brother can't rely on his "14-karat" smile and his "freakish" ability to not be despised. He then decides to let his brother warm things up for him, then he will pre-empt the program to announce his takeover of the Tri-State Area. He then fires the machine up, because he said it takes a while due to "vacuum tubes".

Candace, who is now outside Buford's, was thinking of a way to get Buford away from the computer. As if by coincidence, Buford's mother then calls for him, and he then left the room. Candace, seeing this as a golden opportunity, climbs in through the window and finds the video. She presses the find button, and videos of Phineas and Ferb's inventions begin to play. She then takes the disc, and climbs out again, and starts shouting. People then realize it's her, and just ignore her.

At the Googolplex Mall, Phineas walks over to Slushy-Dawg, where Jeremy wishes him a Happy Birthday, gives him his next clue, and also gives him a Slushy dog on a stick. He asks Phineas if he can think of any strange sentences he has heard this summer. Phineas says he can't then walks away. He then runs back remembering some. As he does, a clip of these sentences plays, but Jeremy can't see it. Phineas reads the clue, and it tells him to return home.

Heinz's invention is almost ready, and he says there isn't a thing that Perry could do about it, unlike all the other times. A video plays, showing Perry and Doofenshmirtz fighting lots of times. Heinz says he shouldn't dwell on it, as it's too painful. Perry slides his tail underneath the TV and pushes a button on it, making it rise up and freeing him. Perry then hits Heinz with his shoulder. Heinz then grabs a TV remote, and pushes a button, shooting a laser at Perry. Perry then runs and grabs another remote, and hides behind a TV. The two then try to blast each other with their remotes.

Phineas is just outside his backyard, and walks in to see all of his friends shout: "Happy Birthday, Phineas!". Doof and Perry are still fighting. Candace is just a few blocks away, disc in hand, running back home. Heinz then destroys Perry's remote, but one blast from his own reflects against a mirror, narrowly misses him, and hits one of the legs on his invention, which causes it to fire.

Candace ducks down to pick up a dollar, and the ray misses her, and hits a TV, causing an amateur sewage repairman to burst some pipes, one of which reverses a one-way sign, causing a DVD recycle truck to travel the wrong way, down a hill. The back door flies open, causing a swarm of DVDs to fall out over Candace. She escapes with the correct DVD, and continues her way home. The sewage pipes blow up, and the repairman's flanch tuner flies into the sky. Some birds chase Candace, making her lose her balance. She trips, and the disc flies into the air. She then cartwheels onto the top of an elephant, which is part of the circus, and kicks the disc into the air. She then grabs a banner, swings on it, and lands on a unicycle. She catches some bowling pins and the disc. She then flies up a ramp, and manages to grab the disc. She lands and does the splits. A kid asks her for her autograph, and a hat and the flanch tuner fall from the sky onto Candace.

Heinz tries blasting Perry again, but his remote is out of batteries. He asks Perry to wait, but Perry pulls out a remote, and blasts it. Heinz ducks, and the blast hits his inator, setting it on fire. Perry flies away, before Heinz curses him again.

Back at the party, Linda and Lawrence were disappointed that they missed the video presentation, but the cake was apparently destroyed by wild penguins, and they were at the bakery to get another. Candace runs in with the disc, and tries to show Mom the disc, but Phineas starts a speech, saying that it's not about your personal desires, but having the best family, the best friends, the people he loves, and those who love him right back. Phineas' speech caused most of the audience to get tears in their eyes, including Candace, who immediately sobs out that she simply can't bring herself to bust them, not on Phineas' birthday. Candace asks herself what kind of person she is, and smashes the DVD with the flanch tuner. Phineas answered her by saying she's a great person, and that if he had a nickel for every time she did something nice for him, he wouldn't know what to do with it. Candace tries telling him she didn't get him a present, but Phineas realizes she has a left-handed flanch tuner, and that it was what he wanted. Phineas hugs Candace, tells her she's the best sister ever and she hugs him back. Five cents appear on-screen. Linda then asks who wants cake, and everyone runs for cake while Phineas and Candace are still hugging and goes along and greets Perry. A clown appears about the invitation of Phineas' and leaves staying that he should have gotten the down payment on the elephants.

"Phineas are ready for my present from me." "Sure Izzy." Phineas and Isabella went up to his room. Phineas sat down on his bed Isabella walked over and sat on Phineas' lap leaned in and whispered in Phineas' ear I want you to strip me and take me now and forever. Phineas smiled He then pulled away and chucked off his clothes. Isabella watched this all in fascination since she never saw a boy naked before. She eyed Phineas lean muscled chest when he took of his shirt. When he took off his pants she saw a nice bulge.

Isabella then got undressed as well she Phineas decided watch her she removed her clothes and soon was fully naked two. Her eyes widen and wondered how that was supposed to fit inside her. Soon Phineas took off his underwear so he was just as naked as Isabella. He then embraced her again kissing her hungrily. Isabella kissed back with just as much passion. they moved to Isabella's room in the centre Soon they were on her bed. Phineas was on to top of her and his hands roaming all over her body. “You’re beautiful Isabella” Phineas said. Isabella just smiled.

Phineas' hands moved to Isabella’s breasts and caressed them with reverence. He was worshiping her body. He squeezed and molded Isabella’s breasts and she was moaning. She never thought feeling someone else doing the same thing she did with her breasts would be so exciting. His hands pinched and rolled her nipples making her gasp. Soon one of his hands moved lower and nudged her thighs apart. Isabella complied and gasped as she felt Phineas' hand play with her wet folds. 

Phineas was staring at her watching how she was reacting. He was mesmerized by her facial expressions. He used two fingers and gently pushed in. It was tight so he had to move slow. Isabella moaned as she felt Phineas' fingers enter her. She never felt this much pleasure before. “Oh Phineas” she moaned. Phineas peppered kisses on her face and neck as he slowly moved his finger in and out of Isabella. Isabella was in a swirl of pleasure. Her mind was totally lost. But soon she felt something building in her from the pit of her stomach.

It was a familiar feeling though it was stronger than it usually was. “Phineas” Isabella whimpered. “Let go Isabella, let go for me” Phineas said then kissed her hard on the mouth. Isabella let go and a great rush of juices came out of her pussy. It was utterly thrilling and better than when she did it herself. Once she came down from her great high she looked Phineas in the eyes and saw him staring back at her with love. “Are you alright?” he asked. “Yes” Isabella said quietly. Phineas moved and he aimed his cock at the entrance to Isabella’s pussy.

He slowly pushed in making Isabella gasp. He was so big and thick she wasn’t sure that he’d fit inside her. She then felt him stop and looked at Phineas with a curious look. Phineas had hit her hymen. He then pulled back some. “This is going to hurt” Phineas warned. “Please Phineas, do it” Isabella whispered. Phineas nodded. He pulled back a bit more and with one mighty thrust he charged forward and broke Isabella’s barrier. Isabella screamed in pain. She dug her nails into Phineas' back so hard that blood was sure to be left behind. Phineas was fully in Isabella, but he waited for Isabella’s pain to subside.

He watched her face to let him know when it was time. Isabella opened her eyes and looked at Phineas. She then nodded, giving her signal that she was ready. Phineas nodded back then slowly drew back. Isabella whimpered as she felt Phineas' cock leave her. She then moaned when he returned to her. Soon Phineas gained a rhythm and Isabella was matching it with her hips. Phineas was kissing Isabella’s face and muttering I love you to her. Isabella had tears in her eyes from this since her first time was with the man she had loved for so long.

Soon she felt that familiar feeling in the pit of her stomach, but this time it felt more intense. Her orgasm came like a tidal wave and she let out a soundless scream and blacked out. When she came to she saw Phineas looking at her with a bit of worry and concern. “I’m fine Phineas. That was the best orgasm I’ve ever had” Isabella said. Phineas looked relieved. “Would you like me to continue?” he asked. Isabella nodded excitedly. She wanted to continue to feel Phineas' cock in her and to have another hard orgasm.

So Phineas began pumping away into Isabella and Isabella relished in the sensations she was feeling. She had a couple hard orgasms and soon she felt Phineas' pace quicken. “Isabella, I’m going to come soon. Where do you want me to put it?” Phineas asked. Isabella frowned for a second then she decided. “In me, Phineas, please” she said. Phineas nodded and with one final thrust he came inside Isabella. Isabella felt a wash of warmth hit inside her and she liked the feeling. "Happy Birthday Phineas."