Dressed in hot latex the lady is jerking her master cock and you little cuckold will watch.
And that's all you can and have to do. Locked up in your chastitydevice you only can watch. No joining the mistress and especially no touching yourself.
To ensure that the mistress added some hand & foot shackles to your cockcage and of course... a gag.
Understandably the mistress doesn't want to be disturbed while she's jerking of her master cock.