"You look like you want to complain about something slave?"
"What is it?"
(You point with your head to your knees)
"Oh..I see.."
"I bet you're going to feel the pain sear through your knees.."
"Reposition yourself slave.."
"But you have to stay on your knees.."
(You try to find a more comfortable position)
"Stroke a little faster.."
"1 stroke per 2 seconds.."
"You can also stop playing with your swollen balls for now.."