"But you, however..." Kim looks thoughtful. "Give me your hand." You hesitate, and she aims the flashlight at your face. "Do you want me to just use this?"
"Okay, okay!" you say quickly, holding out your hand before she makes a change you won't remember. She slides the end of the flashlight into your grip, making sure she still has full control and you can't take it away (though you are tempted).
To your surprise, you see Kim's finger flick the switch back to blue again. She glances at your face and sees your look of surprise. "What?" she asks. "You thought I was really going to turn you into a girl? I'm not a lesbian." She points the flashlight at your crotch - so suddenly that you almost lose your grip - and flicks it on.
The change isn't immediately visible, but you can certainly feel it. The crotch of your pants suddenly feels tight as your cock begins to swell, and at the same time you feel yourself growing erect. It doesn't take long to show, though, a bulge growing into a long ridge that strains at your pants. Before it gets too big, though, Kim pushes the beam down, aiming just under the ridge of your cock. You gasp as you feel your balls suddenly start to swell, and soon you can even see them through the tightened fabric of your pants.
Finally Kim shuts off the light and pulls it away. She smirks down at your crotch. "Now THAT's a package," she said appreciatively. "What do you say we test it out?"