At that moment, Stacy sees the flashlight you left next to you on the bed. You have drifted off to sleep, fully satisfied like never before. Curious, she plays with the light. She finds the pink light and shines it around the room and then onto herself and watches as her penis vanishes and becomes her vagina once again. Suddenly she "knows" what the light does and how things got the way they are.
She sees how satisfied and happy you are laying there, having just enjoyed a joyous female orgasm. She assumes that you must really want to become a girl -- why else would you have done all of this. So she points the pink light on the highest setting at your feet, works her way up your legs to your crotch. She lingers on your crotch and abdomen to make sure that your vagina and uterus fully and completely replace your male organs, and smiles to herself knowing that you now have ovaries pumping out estrogen like crazy, and getting ready to ovulate soon enough. She sees you wince slightly as these changes are completed -- imagining that the testicles probably struggled to the last, but couldn't avoid the transformation to ovaries.
With your lower half complete, she works on your chest, then moves to your arms and hands. At that point, you start to wake up, feeling all the movement of the bed as Stacy changed positions. You see her holding the light and suddenly realize that she has taken control. You look at her and say, "please...", but you are silenced as she points that bright pink light at your throat and face. As quickly as it came, the thought left your brain. You looked back at Stacy and in a sexy voice asked, "What are you doing with that little light?" Stacy answered, "I'm just trying to make you happy!" You answer, "I am as happy as can be, as long as i have you as my girlfriend!" She smiles back, "And you will *always* be my girlfriend!"
Stacy then hides the flashlight in her lingerie drawer, and you quickly forget about it. The deed is done; you are now fully female and with no recollection of it ever being any different. Stacy only remembers you as her boyfriend who wanted to be a girl, and believes she has helped you to completion. Fortunately, you and Stacy are virtually the same height and weight, so you can share and swap outfits anytime.