Train of thought: Changelings and sirens.

Spoiler warning equestria girls rainbow rocks and season 2 finale the royal wedding
Okay headcanon time. (take cower because this is a first one.)
I was wondering if sirens and changelings are natural enemies, It is explained in the royal wedding that changelings feed on love witch is a positive emotion. it is also hedconon from many bronies that changelings can feed on other positive emotions sutch as happiness and confidence etc.
it is explained in equestria girls rainbow rocks (a good movie in my opinion) that sirens uses their voices to manipulate ponies (and other sentient creatures sutch as humans) to make ponies loath and argue with each other, so the sirens can empower them selves (maybe even feed them selves) from the negativity.
and oviously changelings can not work with that since they crave positive emotions and vice versa.

So here is my question what would happen if changelings and sirens met as spiecies. Because an allience or partnership does not seem to be in the interrest on both parts. (I personally believe they would beat the living [cencoured] out of each other for territoral purposes)

now I don't know how rare sirens are in the world of my little pony, (or changelings for that matter) so it might even not be an issue if they can split the prey or something. If they arent that many.
and if we should see this from an another perspective, the ponies them self.
on one hoof you have a paracide bug race that well take the form of your loved one and feed (steal?) your positive emotions. And then what under Celestias bright sun or Lunas calm moon would happen to you?
on the other you have ah charming (seemengly seapony) pony who will manipulate you to argue with every pony you meet (ecsept a chosen few if you are lucky) and suck up the negativity you spread around to other ponies.

. . . you know being a pony seems suddently like being a walking mark for bad things to happen.

Or maybe I just think this tomutch through.
This Thecutesoldier signing off.

PS. I apologise for the bad gramma. english isn't ecsacly my forté. and this writing program doesn't provide writing control