They are 25 in this songfic. They are at a karaoke Café and Phineas and Isabella are already boyfriend and girlfriend. I put this story up before but it broke the rules so I took it down and fixed a few things so hopefully it is all clear now.
Disclaimer: I do NOT own Phineas and Ferb, the song "Marry Me", or Train. All credit goes to the original creators.
Isabella's POV
"Next up is, Phineas Flynn" Says the announcer.
"You're Singing here? What song?" I say
"Just wait and see" Phineas says nervously.
Phineas walks up on stage and Whispers his song to the DJ.
"Before I start this song I would like to dedicate it to a special someone, Isabella this is for you." Phineas says sounding more nervous then ever.
The music starts up and Phineas starts to sing.
Forever can never be long enough for me
To feel like I've had long enough with you
Forget the world now, we won't let them see
But there's one thing left to do
Now that the weight has lifted
Love has surely shifted my way
Marry me
Today and every day
Marry me
If I ever get the nerve to say "Hello" in this cafe
Say you will
Mm-hmm
Say you will
Mm-hmm
Together can never be close enough for me
To feel like I am close enough to you
You wear white and I'll wear out the words "I love you"
And you're beautiful
Now that the wait is over
And love has finally shown her my way
Marry me
Today and every day
Marry me
If I ever get the nerve to say "Hello" in this cafe
Say you will
Mm-hmm
Say you will
Mm-hmm
Promise me
You'll always be
Happy by my side
I promise to
Sing to you
When all the music dies
And marry me
Today and everyday
Marry me
If I ever get the nerve to say "Hello" in this cafe
Say you will
Mm-hmm
Say you will
Mm-hmm
Marry me
Mm-hmm
While the last few seconds of the song are playing Phineas walks up to me and pulls out a little box.
"Isabella, Will You marry me?"
"YES!" I Shout as I tackle him with a hug.
That song is Marry Me BY Train. Pleas R&R!