I didn't write this one, it was by @destiel_666_baby I came across it unexpectedly.
This would work with a mermaid Destiel fanfiction you want updated. MERMAID ONLY, WHICH WOULD PROBABLY BE OBVIOUS! But I guess you can change it around a little to make it work with anything... whatever, just read it :)

I want MOOORE!
I wanna read 'bout the merpeople.
I want some more
Some more Destiel.
Reading all those
What do ya call 'em?
Oh yeah, fiiiiics!
Up where they ship!
Up where they write!
Up where I'll read gay stuff all night!
Reading so free
I love to be
Part of this thiiiiiing!

If destiel_666_baby is reading this, can I come up with an extended version of it? I'd probably have to look up the original lyrics, but it'd be worth the effort :)
And if anyone has their own parody they wrote or want written, don't hesitate to comment!