Learn to keep stroking
And what do you say? No not 'nice', you thank me for showing them to you!
I'm now going to teach you some advanced tricks, to stop stroking, without making it look like you stopped. It will look good and interesting to your Mistress.
Doesn't that sound promising? What you have been doing so far is only stroking with one method. 90% of the slaves i met stroke it with their thumb and forefinger on the upside, and their pinky finger at pushing towards the base of your cock.
Stop stroking for a second and flip that around, so your thumb and forefinger build a ring around your base of your cock, and your pinky is pushed over your glans first when you stroke upward. Try to stroke and standby speed this way.
It feels different, but still good. Maybe even better? Get used to this stroking method for 2 Minutes, then ...