I think you are ready now for the challenge. Maybe even a little too ready. Do your best....
Use your hands alone to bring yourself to the edge. Take all the time you need, but you need to get really close. One thrust away from cumming close. Once you are there, one second away from exploding, get your timer ready and continue.
Be really sure to be as close as possible. If I order you to cum within 2 seconds after you click continue you should be able to do this without effort. Ready? Ready? READY?