Riddle Me This:
I gallop in pairs underneath all the waves.
I hope that my children aren't what he depraves.
I'm upright, not forward like most of my friends.
I thank my consumption as it never ends.
We dance for as long as your pillow bears weight.
It's colour, not matter, in changing of state.
Inept as I am since without I can tire,
Though guess what I am to fulfil your desire.
My previous riddles were longer, thus describing the subject in more detail and making the riddle potentially straightforward. I have made it shorter now $(8$ lines instead of $10)$ and I have tried making the rhyming a little bit juicier.
I also will not be putting hints until tomorrow if this riddle is not answered (or answered incorrectly), and I also assume your desire is to answer this riddle :)
Hope you enjoy!
The last line
Guess what I am to fulfil your desire
is part of the riddle (and not just a fancy way to finish it off).
Added the word "though" to the last line, as it makes better-matching syllables.