A/N: Here it is guys! If you haven't read the prequel, "Phineas and Ferb: Across The 2nd Dimension 2", you won't get the storyline, so you should start there. If you have, I appreciate it and as promised, here is the after story between the two different characters.
Just like before:
Name = 1st Dimension 2nd Name = 2nd Dimension
Enjoy ^^
It's been 6 years since the incident, and at SIR, the alarm suddenly goes off.
"Sir!" 2nd Charlene alarmed her boss. "Someone's infiltrated the SIR!"
"Impossible," 2nd Carl said. "Unless...Charlene, it's fine. I know who did it..." When he looked at the camera in the SIR, he recognized that dark hair anywhere. "Go get him, girl." He said to himself. He turns the alarm off and gets his cell to call a certain Japanese girl. "Hey, it's me. Wanna go out tonight?"
"Listen here, nerd," 2nd Stacy threatened. "I only gave you this number because Candace told me to, not to try to hook up with me...I'm hanging up!" She hangs up.
"She digs me."
Warping into the current Danville...
"What should we do today, Ferb?" A 16 year old Phineas asked his brother in his now lowered voice. Phineas' hair grew longer, so he had it in a ponytail. His signature clothes were slightly altered as they bore the same colors, but the stripes on his shirt were thinner and his shorts were now jeans. Other than that & getting taller, Phineas looked the same with his triangular head.
Ferb just shrugs. Still taller than his brother, his white shirt now a white T-shirt with purple slacks. Ferb's hair also grew out but he let it flow down his neck. Their mom refused to let them get their ear pierced.
A wormhole appears before them as a familiar face enters their backyard.
"Hey guys, whatcha-" Isabella started to say but cut off the question when she saw the hole. "Whoa..." From there another ebony-haired girl steps out, the hole vanishing behind her. "Isabelle!"
"Hey Izzy," 2nd Isabella said as her twin runs and hugs her. The two have been in constant contact using a special phone that works like a regular phone but it allows you to talk to people in other dimensions, built by Phineas and Ferb of course. Since the incident years back, Ferb came up with the idea the day after, and of course, Phineas was all for it. The Isabellas were tired of saying their whole name to each other over and over, so they decided to change it a bit. 2nd Isabella calls Isabella 'Izzy' while Isabella calls her twin 'Isabelle'.
Ferb looks at 2nd Isabella. Both Isabellas, being the same person, were practically identical in terms of their figures, the growth spurt making them the same size as Phineas. Their bodies going through the drastic female change as they had more curves than they've ever had...in many places. The difference between the two was their attire. Izzy changed up her signature pink dress to just a pink skirt that went down to her knees, her white inner shirt stayed. Her hair in a high ponytail, tied by her signature pink bow that was once on her head. Isabelle's look remained out of the goody-goody colors of pink and white to green and black. She wore cameo pants and a dark green shirt with black boots and let her long balck hair down like how Izzy's hair used to be.
Letting go of herself, Isabelle noticed Ferb checking her out. "Missed me?" She asked, winking.
"Well, I-" Ferb started to speak, but was about to be interrupted by Phineas, when...
"Guys, quiet down," Isabelle asked them. "Please go on, Ferb."
"Well, I was thinking about visitng you today," He admitted. "But you beat me to it."
"I'm here. Let's go out...on a date." She asked him, still shy about asking him, looking down to her feet waiting for his answer. Ferb didn't answer as he walked up to her and held her shoulders.
"It's more polite to look someone in the eyes when you ask a question like that," He said, trying to get her to shake off the fear. "Look at me."
She looks up at his blue eyes and couldn't look away.
"Now...let's try that again." He said.
"Will you...go on a date...with me?" She was hesitant but came right out and said it to his face.
"I'd love to," He answered.
"Great!" Izzy said. "C'mon, Isabelle. Gotta get you a nice dress..." Izzy pulls her twin away...but not before kissing her boyfriend. "I'll meet with you later," She said, caressing his triangular face. She hoists Isabelle across the street to her house.
"Well, I guess we know what we're doing today," Phineas said.