"I'm sorry hubby, but when I let mummy lock you in your chastity cage for a bit of fun, she took the key with her. Never mind she back again at Christmas, I'll ask her to bring the key with her then, but till then you'll have to stay locked. Mind you I do find it ever so exciting my mum being your key-holder, why don't you lick me to a lovely orgasm, there is no point both of us going without."