I'm noticing a worrying pattern with girls with big gapes, happened with Kristy Black and now with Susan Ayn for few scenes already - they stopped farting during anal and fart only during creampies. Or they fart and the audio is muted (exapmle - this scene: https://pornbox.com/application/watch-page/215779). What happened? I doubt the grew shy all of a sudden, so my best guess it that it's a dircetor/studio decision.
It's obvious that with gapes that big Susan has tons of air in that booty that need to be let out - why aren't the director encourages her to just push out? I know the male talent like Freddy and Dylan dig it, so why holding back???
BRING THE FARTS BACK