Master Mercies wanted to fuck Audrey's face in a way that was extra uncomfortable. So he rigged up a pulley system and connected her hair to her underwear. The result was a wedgie that dug into her ass crack every time he pulled her head onto his cock. Then he made her slurp on his ass and eat his cum.
Sometimes, you need to focus on your own feelings. Dr. Mercies was in just such a state today. So as Audrey took on different feelings, he just fucked her mouth through all of them, focusing on his own pleasure. She was a good, obedient facefuck/rimjob slut. This session has the peaceful calm of quiet, gagging obedience to it. And that's all you need some days.