https://www.furaffinity.net/view/60828976/
The song for the story with the same title.

Lyrics:

They met by chance
He was so small
She was five-ten
He's four inches tall
Both were alone
Now never again
Will they part
They're lifelong friends

Simon the mouse, in love with a giant
Once he was, a doctor of science
Respected by many, he was hell-bent
On proving himself, before the accident

Amber the fox, always rejected
Now she's found love, at the hip they're connected
They can't make love, in the classical sense
They will make it work, together they were meant...
To be...

The fox was rebuffed by the man of her dreams
She sat and cried alone in her car
She saw a strange bug at her extermination job
He ran away but he couldn't get far

It turns out that bug, wasn't a bug at all
But a genius who had shrunk himself small
Simon was his name and he's in the science game
A little mouse that once was quite tall
The giant fox is kind to him and treats him with respect
The little mouse is just what she wants
The two are perfect for each other, companions till the end
She carries him inside of her bra

The wacky fox and the genius mouse are an unlikely couple
But sometimes life doesn't make sense
They say opposites attract, they say that love is blind
A better companion he could never find
Because

They met by chance
He was so small
She was five-ten, and he's
Four inches tall
Both were alone
Now never again
Will they part
They're lifelong friends