Since you like my panties so much, would you like me to show you my bottom?
You can stroke as fast as you like, but be careful! If you cum that's it, tease over, and I won't help you any more.
Ooh you're doing it quite hard, is your dickie getting all tingly yet? But stop as soon as you feel those naughty tingles in your balls. Are you getting any? I bet you are, I can tell.
So stop, otherwise we'll end up with your usual premature mess, won't we?