Moaning.

Like a cat in heat.
Like a mournful humpback whale.
Like a haunted garage door.
Like a car in need of new break pads.

I'm not sure if I would describe it with a simile though, if the intention is to make it clear that the moan is fake?

Otherwise I might read it as just making fun of her weird sex noises. Could be fake, or could just be odd!

Maybe "Stage moan," or "Exaggerated pornstar moan," or something like that?
Are you speaking from experience?
 
She moaned... oh... never mind. That was the floor creaking when she stepped out of bed. "While you're up, could you start the coffee, please?"
 
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