You consider for a moment, and then think of something you're not sure is possible, but you really want to try. "Uh... I know you can change people's species, but... what about changing their sex?" You blush as you admit, "I've kinda always wondered what it'd be like to be a girl."
The girl smiles, and says, "Yeah, I can do that too! And don't worry, I've used my power to try turning into a boy, so I getcha." She laughs and you laugh along, before she shuts her eyes and focuses for a second. A second later, she opens them again and remarks, "You might wanna take your clothes off, by the way. Trust me, I've ruined a lot of nice outfits because I decided to shapeshift without thinking!
A tingling sensation starting to race through you, you decide to follow her advice. You pull off your hoodie and T-shirt, drop your jeans and pull off your underwear- you figure if she's happy to get naked in front of you, you may as well be too.
Not to mention it gives you a good view of your body changing. It's weird, like you're melting and setting in a different form before your eyes. Your arms and legs seem more slim and your hands and feet more petite, and you notice your torso pull inwards in every direction until you have a curvaceous figure.
A shiver crosses your skin and it pricks up, and you notice you seem softer and smoother all of a sudden. You touch your skin and it feels suppler, and when you gasp you notice your voice has softened and is higher pitched. Even your facial features have gone through a subtle shift, and your hair has lengthened down your back.
Something seems to well up inside you as the most distinctive part of your change of sex takes hold. Your nipples perk up in the cold air and swell well beyond their normal size, and when you brush over one with your finger, you pant with pleasure. As you look up at the girl, she has a knowing expression on her face that says, You're going to be like me now.
Warm flesh rises around your teats and you ache to have them cupped and sucked on. You continue to pinch and rub your nipples more and more eagerly, unsure how you ever went without this pleasure when you were a boy.
That thought momentarily jolts you out of your aroused haziness, and you peer down to your erection, whimpering as you feel it slowly shrink back into you.
While you shift from having a hard manhood to fuck others up with to a tiny sensitive womanhood to give you intense pleasure while others fuck you, you also feel your balls pinch up and slip up inside your body to turn into ovaries while your scrotum turns into a vaginal slit.
While you come down from the high of transforming, the girl asks teasingly, "So, do you like being a girl?" You nod breathlessly.