Another White Slave for the Sheikh — Allan Aldiss

Here in his luxurious palace in North Africa, they are kept hidden away under the close supervision of his black eunuchs. One of Allan's keen readers, Bill, to whom Allan has dedicated this continuation of the Sheikh story, then suggested that he should describe what would happen if an angry wife used the Sheikh to get rid of her husband's Mistress. It so happened that this was just what had recently happened - and in a most unusual and erotic way.