Jon had always had a secret fetish. He had often wondered what it would be like to pee as a girl. He wanted to experience the feeling of "letting go" and having hot pee gush out of a vagina instead of a penis. It had always seemed more convenient to him that girls could pee sitting down, without having to aim anything downwards; as a guy, he usually went standing up, and wound up dribbling some pee onto his underwear afterwards as the flow slowed. Previously, he had fulfilled this fetish by watching videos of women peeing, imagining himself in their place. Now, he had a girl's body, and could pee to his hearts content. Unfortunately, Zoe didn't need to pee when Jon possessed her, and with his mother pestering him to get ready, it seemed he wouldn't have the opportunity to develop the urge. Clearly, some wishing was in order. He grabbed the stone, and made his wish:
"I wish that Zoe was excused from attending school today, and that Mom would leave the house for the rest of the day." The stone glowed, and Jon heard the unmistakeable sound of his mother's car starting. He was somewhat surprised to hear the words come out in his sister's voice; it was still sinking in that he essentially was her.
"I wish I had a pitcher of cold iced tea," Jon pronounced, and a jug of amber liquid appeared on his desk. He knew he could always just wish his bladder full and start peeing right away, but he wanted to experience the sensation of becoming full and bloated with pee by drinking lots of fluids. He poured himself a glass and chugged it down, feeling the cold liquid slide down his throat. He poured another and drank it as well, continuing until the pitcher was empty. After a few minutes, he began to feel a familiar pressure, but centered in his abdominal area rather than his penis. Jon shivered with anticipation of what was to come. He locked his knees together to try to hold it in, as he no longer had a penis to grip. Slowly, he waddled to the bathroom across the hall, not wanting to have an "accident". He could almost feel the pee sloshing around in him. Closing the door behind him, Jon pulled down Zoe's panties, hiked up her skirt, lifted the toilet lid, and sat Zoe's pale posterior on the toilet.
Now was the moment of truth; he was finally going to experience the joys of female urination. At first, he tried squeezing the muscles of his bladder, to push the pee out, but found this was futile. The pressure was overwhelming at this point, the need to go insistent. He closed his eyes and breathed deeply, thinking of running water, waterfalls, a river- and yes. A trickle of urine emerged from his female urethra, and quickly widened to a gushing stream, making a girly spraying sound as it hit the water. Jon let out a feminine sigh of relief, as the pressure began to fade. It was weird, feeling the urine spray not from the tip of his penis, but from a hole inside him, and dribble between his labia. He lamented slightly that he didn't have a mirror, nor any way to see his girl-bits in action; but feeling them was enough. The flow of pee continued for about 15 seconds, since Jon had drunken so much tea, but eventually trickled off. Thanks to the configuration of Zoe's anatomy, Jon realized he would have to wipe. He grabbed a wad of toilet tissue and wiped Zoe's vagina from front to back, then dropped it into the now yellow toilet water. He flushed, watching his urine swirl away into the sewer.
Jon was now left with the remainder of the day to explore being Zoe, as well as any related female-exclusive experiences. This was going to be interesting...