"Oh shoot, fuck, sorry, I almost forgot that i'm the nice mistress right now, sorry. You may slow down again, go with a good medium pace to stroke that big, hard, throbbing cock for me"
(You do as she says)
"I'm just not used to all of this and I guess I got a little bit carried away here for a second slaveboy. Are we still good?"
"Y..y..yes mistress, n..n..n problem mistress"
"Alright my little handhumper, keep going, pump that thing."