Wrap the chain of the clamps around the wrist of your primary hand. Use a shoelace if necessary. Now, bend all the way forwards and put that hand on top of your cock. Now, rise until there's no slack on the chain.
Jerk your cock once!
Mmm, that tugs your nipples nicely, doesn't it?
So slave, how many strokes like this do you think you could take?
Decide, then click Continue. To make sure you're being honest, tell your Mistress your number before you continue.