Like you!  If only you could wank for real... but you can't touch yourself.  Not in that cage, the best you can do is fantasise about it.  Even if that does make your cock strain and ache and throb.  But even if you can't jerk off, why should you be denied the pleasure of my soft voice administering your jerk off instructions...  This is just the most delicious mindfuck.  And the perfect chastity and denial viewing.  There's even a cum countdown to suffer through, which you will.  Because you're such a good boy!