(3rd Person POV)
It was around 11:30 when I woke up Ferb.
"Ferb! Wake up," I whispered to Ferb.
He turned over, still obviously tired, and gave me a 'what?' look.
"I talked to Candace earlier and she said that I like Isabella. And I think I do like her. I just want to know if she likes me and how I should tell her that I like her."
Ferb, once again, couldn't believe what he was hearing.
"I don't know if she likes you, but I do know what you can do to tell her," Ferb knew he couldn't tell Phineas that Isabella liked him because he promised her.
"What should I do then Ferb?"
"Do what you do every day, build something."
"Ferb! That's genius. I know what we're going to do tomorrow."
Ferb then went back to speak, but Phineas stayed up a while to design the thing he was going to build tomorrow for Isabella. He knew she would love it, but he didn't know if she would like him back. Secretly, he was afraid she would say 'no' to him and ruin their friendship, but he had to be his optimistic self.
The next morning, Phineas woke up at 7:00, as usual, and got ready as quickly as possible.
Ferb was right behind him as they went to go sit under their big tree. He was eager to know what Phineas had come up with to show his love to Isabella. But he knew that whatever he came up with, Isabella was going to say 'yes'.
"So Ferb, while you were sleeping, I came up with this," Phineas said while rolling out a blueprint for a Tunnel of Love.
"I already called Buford and Baljeet to not come over today, so we won't have to worry about them," Phineas said, "and I was hoping you could control the tunnel for Isabella and I."
Ferb didn't really care about being left out so he gave Phineas a thumbs up.
"Great! So let's get started!"
-Later that day-
"Wow! This turned out great," Phineas said, admiring his work. Ferb meanwhile was in the control room waiting for Phineas to send him the message to start up the ride.
(Phineas' POV)
As I was waiting for Isabella to arrive, I was in the dark tunnel in the first car. I was hoping Isabella would walk in the tunnel and see the sign I set up. Once that happened, I would surprise her and tell her my feelings.
(Isabella's POV)
"Hey Phineas! Watcha doi- Phineas? I walked into Phineas and Ferb's backyard ,but no one was there and the was a Tunnel of Love just sitting there. 'Could this be what I have been waiting for my whole life?' I decided to go into the tunnel because that was the only place I could think of to look for Phineas and Ferb. As I went in, I found a sign leading me to the first car.
"Isabella, go to the first car and wait for just a minute. –Phineas," I squealed with delight as I read the sign. I then did what I was told and sat in the first car.
(3rd Person POV)
Phineas heard Isabella coming, and hide under the seat. When she sat down he popped out.
"Hi Isabella!" Phineas said.
"Phineas! You scared me!" Isabella said clutching her heart.
"Sorry about that. But anyways, I wanted to tell you something," Phineas said, kind of nervous.
"Yes?" Isabella said excitedly. Is he about to tell me what I have longed to hear!
Phineas then sent Ferb the signal and the ride started.
"You see, Isabella. For the past month, I have been getting this feeling every time you came to see me and Ferb. And it progressively got stronger and stronger. Eventually, I got lost in your voice and kept looking at you. I decided to talk to Candace and she said I was in love. At first, I didn't think it was true but now I think it is. What I'm trying to say is- is that I- I like you Isabella. So, will you be my girlfriend?
Isabella was in complete shock. She always wanted to hear these words, but she found herself completely speechless.