Sissy maid Lisa has finished all her chores so she thinks that since she has been a good girl she will as and maybe Mistress will release her from her chastity.
Not so lucky. Lady Sara carefully inspects her chastity and makes sure that sissy Lisa knows that Mistress is the only one who decides when she is alowed to cum. The rest of the time she will be locked up in Her tiny, tight chastity device.
Once you're locked up for Lady Sara Borgia, your cock belongs to Her forever.