Jon held the stone tight in his hand and wished. "I wish that both me and Karyn could change genders at will, along with clothing and other articles associated with the gender. I wish in whichever gender we are we'd keep all our old belongings and friends as well as gaining new gender specific ones. I wish, that we had two dorm rooms, one for both of us as females, and one for both of us as males, and that nobody would find it strange if we don't come to our other dorm to sleep. I wish that we can modify, add duration to, or even cancel this wish with another wish whenever we want."
Neither felt any different, but checking their college information, found that their roommates had changed, Jon's had become Ken Black, and Karyn's had become Jen Madison.
"Interesting." Karyn said
Both of them tried their new powers, and found that they could quite easily shift their genders from one to the other, and choose what they wanted to wear when they shifted.
"Cool," Thought Jon, "well let's move in."