In my years of experience as an experienced JOI Mistress, I have found that very short, painful strokes of 5 seconds are perfect for making you horny, nervous, and even more submissive. It will never be enough to finally cum. And that is what I want to achieve with this cruel game. You don't deserve to control your own cock, so I only let you stroke for 5 seconds at a time. Then you take your hands away, like a good little slave should. You will hear a command from me when you can jerk off again. Sometimes I will be nice and let you jerk off many times in quick succession. Other times I will make you wait again. Either way, you will feel the constant and total frustration of having to take your hand away again after 5 seconds, even though you have only just started. And you will reach for your cock so desperately when I give you another 5 seconds to enjoy the pleasure. While you hang on my lips and beg me to let you jerk off again so you can finally cum. Does this thought frustrate you, my slave? Oh, I will fuck your brain endlessly.