"Gender swap," he read aloud. "Well, I guess it might be fun to see what it's like to be a girl." Nate locked his door, stood in front of his closet mirror, undressed, and once he had gotten naked (he figured he'd like to see the view), pointed the remote at himself and pressed it.
His breath hitched as he saw his whole body start to reshape. His face suddenly looked softer, his lips were puffier, his jawline was less pointed, his hair reached further down his back. The changes moved downwards and his figure slimmed down and seemed to curve, his shoulders slunk inwards and his hips pushed outwards, his arms and legs turned lither, his hands and feet were more petite, even his nails seemed kinda longer. His skin seemed to smooth out, and most of his body hair vanished.
Now the feelings from the process turned from strange to really pleasurable as his sex characteristics changed. He felt his nipples vastly increase in sensitivity and expand, and soft mounds of flesh swelled under them until he had finished sprouting breasts. They were about a B or C-cup, and Nate was surprised to realise he really felt like he'd like to have them played with by... a boy. Even his sexuality was altering. Now the last part of Nate that was still male began to shift to female; he saw his penis recede into him while still feeling hard and erect, and his testicles tugged upwards and became ovaries. As his penis finished turning into a clitoris and his scrotum refashioned itself into a vaginal slit, he- or rather she- felt herself relinquish his manhood and accept her womanhood.
Nate- or Natasha, as she realised her name was as a girl- looked at herself in surprise for a moment after the changes finished up. "Wha... does this thing really work?" she asked, shocked by her girlish new voice. Apparently it did. She'd just altered reality to make it so she was born female instead of male, and there wasn't even a hint her body had looked anything but female.