After the third time he can hardly bear the strength of his desire for her, and so he takes her back into his treasury and shows her a hidden door.
In a room behind rest three Wish diamonds that he's accumulated through ages, waiting for five, as is the clock that ticks ever so slowly to measure the long lives of Efreet. Strength, Constitution do Efreet give themselves, in this way; Splendour and Wisdom for Malik; Intelligence and Dexterity for royalty. A millennium might pass between one diamond and another, and they agonize whether to become stronger today to accumulate their gains faster tomorrow, or wait today to cast in longer sequences.
"Swear yourself to me and I shall grant you your Wish," he says, as is folly and madness in truth, for a Wish is wasted on a mortal that passes away in a century. But the desire in Befutig Safiza Uj-alet is such that he cannot bear it.