Set the timer for 10 minutes. If you're using the online timer you should turn your speakers up so you can hear the timer go off while you're sitting in the chair.
When you start the timer you must move quickly. Trust me, the faster you do this the better it will be for you!
You will sit down in the chair with your legs spread. Take the rope from your left ankle and tie it to the back left chair leg. Pull it nice and tight so your foot is pulled back and your knee is pulled off the side of the chair.
Do the same with the right ankle on the right side.
Then take your wrist and tie it to one of the back legs (whichever side it's on)
Now take a moment to settle in, bound as you are, in front of a public window. You will not untie yourself until the timer goes. Also you will keep your eyes closed the whole time!
However, the whole time I will allow you to play with your neglected little pussy. But, of course, tied up with your legs apart you must play with it through your pants. Even if you can through your pants, you do not have permission to cum!
Now start the timer and go. When you're done you may return.