And another!

By recommendation:
Ruby the DemonRuby the demon is a bitchy, slutty soul,
With a low-cut top and a special knife,
And two eyes as black as coals.
Ruby the demon is a good demon they say.
She was sent to Hell and down there she dwelled,
‘Til she came to Earth one day.
There’s got to be much magic in that
Ancient knife she’s got.
For when it stabs a demon’s host,
It’s dead right on the spot.
O, Ruby the demon,
Was a human long ago.
She had been a witch, then she’d tried to ditch,
And was sent way down below.
Stabbity stab stab,
Stabbity stab stab,
Look at Ruby go!
Stabbity stab stab,
Stabbity stab stab,
Into their chests and throats!
Ruby the demon knew
About Sam’s psychic skills.
So she said, “Let’s train,
We’ll work through the pain,
That’s enough whiskey refills.”
She trapped some demons,
And they purged or killed each one.
The demons were jerks,
And it took some work,
But Sam exorcised a ton.
When Dean returned and then he learned,
What Sam had done with her,
He said it was a slippery slope,
To hunted from hunter.
Ruby the demon
Left Sam for a little while.
She had said to Sam,
“You know what I am.
Angels think I’m wholly vile.”
Stabbity stab stab,
Stabbity stab stab,
Look at Ruby go!
Stabbity stab stab,
Stabbity stab stab,
Into their chests and throats!