Hmm... I like what I see, slave. A horny, pathetic man naked for me, with a hard cock and sore balls.
Now I want you get comfortable. When you are, wrap your fingers gently around your cock. I want to tease you so that your mind will be more pliable. Just leave your hand there and grip yourself lightly.
Now, rub your fingers forward, just a little. Then back. Keep moving your fingers across, very slowly, caressing it. Feel it get harder. Hopefully it will throb against those fingers. Look at my fingers and feel me toying with you.
Just play lighty with yourself for a while and look at me. When you can't stand it anymore, you may grip harder and stroke properly.
Enjoy that feeling of satisfaction. It might be as good as it gets.