Taking care not to wake anyone, you sneak to your room and sit on your bed, digging the flashlight from your jeans pocket.
You've had quite a day with this thing, haven't you? Between Gene being a man in a woman's body (save his junk) - which got him a girlfriend somehow - and your parents now both female and surely lesbians, among other things, you've changed a lot of stuff, yet not much is too different.
Perhaps it's your turn to try this out.
When you think about it, it's strange (to put it lightly) being the only guy in a house of girls who like girls. It would be fun to at least test out a female body, especially if you could find your girlfriend for your own lesbian action. You don't much like the idea of being feminine, though; being a girl sounds fun, but being girly seems a bit uncomfortable. Maybe you'd make a good tomboy.
As you set the light to a low pink, you remember the indifference that everyone else feels at their alterations - it would be a problem if you didn't realize your changes, especially if it sent you into a loop of gender-switching. After fishing the light's manual out of your pocket, you look it over. "Anyone except the user" - as long as you're the user, you'll be aware even if you change yourself. You nearly slap yourself as you recall the very first thing you did with the light - you gave yourself boobs for a moment, and you'd certainly noticed that.
Well, you think, why not. Let's do this.
You turn the flashlight on and run it up your legs. Your shoes shrink a little to accommodate your smaller feet, but your jeans merely shorten an inch or two with your slimming legs. Now, a big moment as you reach your pelvis, and your hips flare out a touch, though your jeans still fit. Your crotch feels different than what you're used to, but you can investigate that later.
The light moves up your stomach now, and you feel curvier as your shirt, again unchanged, hangs loosely off your shifting frame. As your chest is lit, you note a modest ridge in your shirt, though the new additions don't seem supported by a bra - are they bound, perhaps, or are you just braless? You'll find out in a moment, you chide yourself as you take turns running the light over your arms and shoulders.
Well, time for the last part. You run the light over your face, shining a bit behind your head as well.
Time to see the new you. You push yourself off the bed and onto your feet, almost stumbling due to how your lesser mass is distributed differently. Shifting your weight to calibrate yourself, you get a feel for this new body. Once you're finished with that, you walk over to the full-length mirror on your wall, taking in your appearance.
Your hair's a touch longer, maybe an inch or two, and a bit more scruffy than you'd had it. It works nicely to frame your androgynous face - soft yet boyish, and quite attractive. You're just a few inches shorter, too, and your clothing hangs somewhat loosely from your redefined shoulders and hips.
You could still mostly pass for a guy if needed, but you're most certainly a girl now - and you're raring to throw your clothes off and acquaint yourself with your new additions.