"Then so it shall be..." you hear the genie's voice boom across the desert, as you suddenly feel another jolt of energy passing through you, much stronger than the first.
Your arousal becomes stronger, but your dick does not grow any larger. Instead, it seems to shrink.
You feel a strange, but pleasant heat all over your body, and not from the desert air. You feel it in your chest, which begins to expand as your shoulders narrow. You feel your nipples harden at the tips of your swelling breasts, which are now held in place by a bra as your white shirt billows loosely in the wind around your changing frame.
Your pants also hug your changing legs tightly, as they shrink into a pair of shorts revealing your thin and hairless legs. You let you a feminine moan as your hips flare and your manhood disappears inside you, making you a fully functional woman.
You fall to your knees in the sand as the last of your changes occur. Long hair brushes past your shoulders and takes on a cute new style and color. Your face changes to give you the beautiful feminine features that your boyfriend desires.
Your roommate has no complaints, it looks like the desert just got a lot hotter!