You want to be just as hot as your bombshell sister. Using the program, you copy her appearance stats over to your own page. However, you make sure to keep your sex as M, just to see what would happen.
Once you hit enter, the change is immediate. You automatically notice a buzzing feeling as all your body hair below your neck instantly falls to the floor. Your skin feels smooth and soft now. Next, you notice the world rising above your head as your body shrinks down to a meager 5'3. It feels so emasculating to see everything tower over you now.
Your legs and arms start to get more slender and your body starts to reshape to appear more feminine. Your upper body and waist loses all of its definition while your hips and thighs start to fill in nicely. Finally, your face starts to get more girly as you get a cute button nose and a smaller chin.
Suddenly, your clothes start to transform as your underwear turns into a set of cute pink nylon panties and a (useless) pink bra covers your pointy nipples on your flat chest. Your pants disappear and are replaced by white stockings that go up your thighs. Your sneakers become 6' black stiletto heels. Your shirt is replaced by a crop top and a skirt that leaves an embarrassing gap showing your thin waist. Finally, you get white gloves that go up your arms and a cute choker.
You look at yourself in a mirror. Although you asked to look like a twin of your sexy sister, you look more like a cute girlyboi instead. Did something go wrong?
Suddenly you feel a deep rumbling as something massive is changing. You look inside your skirt as your dick is changing. You get super horny and your dick responds, however, it only goes up to 4 inches fully hard. It also seems like your hairless balls have gotten smaller too. You feel like your chest is on fire and touch your erect nipples. A pair of breasts grows as you touch them. Together with your dick being stimulated and rubbing your boi nipples its too much as you cum into your soft pink panties while moaning like a girl. You've grown D cup boobs! Now your transformation is complete!
You want to go show yourself off to your sister...