It's impossible to find the original lyrics posted. It's a gorram good song, though. Anyhow,

Seein' you thinking 'bout the engines that you're fixing

make the ship fly with salvaged parts

I forget that there's another Kaylee

a sweet girl with an honest heart

I saw the way Inara put your hair up

saw you smile when you got that dress

saw the way you always looked out for me

I was a fool, this I must confess

I wonder why I didn't know that I loved you

And I wonder how I've been so blind

Why did I wait 'til we'd been cornered by reavers

to tell you what's on my mind?

I never told you that I thought you were pretty

never knowing you were feeling this pain

Like a moonbrain I just stood on my honor

'cause in the Black nothing else remains

I wonder why I didn't know that I loved you

And I wonder how I've been so blind

Why did I wait 'til we'd been cornered by reavers

to tell you what's on my mind?

I never asked you if you really loved me

scared of what answer you might give

but now I know that you want me that way

To hell with this, you know I'm going to live