Why not ask them

You cautiously step into Tracy's cubicle, making sure not to step on any of the used condoms or spilt cum on the floor. Stepping closer you find her beady eyes staring up at you as she pants from the intensity of the past four hours. Once within arms reach of her, you remove the ring gag from her mouth, making sure not to touch any of the used condoms scattered on her face.

"Well slut, how are you doing?"

"Very good thanks sir." She purs back at you.

"I see you got plenty of visitors." You say, indicating all the condoms scattered around the cubicle.

"Yes sir. Plenty of your employees were kind enough to come use me. Most of them multiple times already." She replies in her usual lust hazed tone.

"Very good to hear. It seems they weren't quite rough enough with you though, were they?" You say, grabbing her hard by the nipples as you say this and squishing her tits.

The pain turned to pleasure that she gets from having her body abused in such rough ways causes her to gasp and stare back up at you with her mouth agape.

"No sir. They were far too gentle for a dirty slut like me." She pants back at you, like a bitch in heat from being tormented so sadistically.

"That's a shame, we'll have to fix that won't we."

"Yes sir." She purs.

You take a black sharpie from your back pocket and remove the cap, using it to write on Tracy's forehead.

Be Rough

This is all you write on her body, but you figure it'll get the message across.

"That ought to do the trick." You say, admiring your own work.

You hand the sharpie back to Todd who's been watching on this whole time.

"Do me a favour and write the same thing on Mia will you."

Todd eagerly goes to write the same concise message in the same spot on Mia's body.

"Now, I trust you've followed your usual rules about cumming?" You ask Tracy.

"Of course sir."

"Would you like to finally cum my slut?"

"Yes please!" She says back with great enthusiasm, to be expected considering she's been edged for the past four hours.