Standing in the kitchen watching your little sister Jessica play with her dolls in the other room you think of what you should do to her and since she's really nice to you. You don't wanna do what you did to Amanda making her as hideous as you possibly can because she's always mean, so looking at Jessica play making her dolls talk to each other in different voices and stuff.
Just then you remember that you think she as a big interest in the opposite gender, not really in the terms of dating and stuff more like in the terms of why do boys get to have penises and girls don't kind of thing. Remembering that you get a grin on your face as now know what you should do to her. Then you remember her friend Abbie and that she has a brother George that you have seen a few times and that Jessica has acted a little weird around him sometimes. Yeah he's perfect you say to yourself as you focus on Jessica cute little body and begin morphing it into George's 8 year old body.
First you begin with the size of Jessica's body making the proportions bigger to match the age of an 8 year old boy, putting a lot of strain in her clothes. Being very aware of surroundings all the time immediately notices that she has some how just grown a lot and her clothes are to small. Just as you see her about to get up you begin your next morph as you begin changing her body shape to be less girly and more boyish putting even more staring on her little pink princess shirt and her little frilly pink skirt. Which are both on the verge of ripping at the seems. As for Jessica she's sitting there wondering what is going on with her why did she just suddenly grown fro no reason.
After that you begin to add the main thing that makes a boy a boy, slowly you morph a small pair of smooth balls between Jessica's legs as her pussy disappears leaving her moaning as it happens. Just as she recovers from that you morph the next thing which is what you imagine the size of George's penis is. A 4 inch penis suddenly erupts from Jessica's crotch just above her newly formed balls. After she had recovered from that Jessica felt a tightness in her panties and wondered what it was, so she stood up and in the process it was to much for her small clothes as her shirt suddenly ripped clean off followed by her frilly pink skirt falling down around her ankles. Next to fall off is her pink underwear falling down around her ankles letting you and her see her newly formed boyish figure.
Jessica just stands there naked in the living room looking at her boyish figure especially the penis dangling from her crotch and so are you. You can't believe that it actually worked and that your little sister is now basically your little brother. Slowly she reaches down with her boyish hand and pokes her penis causing her to let out a soft little moan, "wow I'm a boy!" Jessica yells in excitement and begins hopping up and down, but stops when she noticed you standing there, "oh my god look Andrew I'm just like you. I'm a boy."
"You sure are Jessica."
"I can't believe it! I have a penis, look at it Andrew." Jessica's says pointing at it.
"I can see that, but what are you going to do now."
"I don't know, I'm so excited!" She replies hopping up and down again then runs over to you and hugs you tightly rubbing her naked body on you especially her penis. "Oh my god!" She says as her penis suddenly feels weird.
After that she backs away and sees that her once soft penis is now sticking out from her crotch and looks bigger, "wow it's bigger, but how?" Jessica said looking up at you.
"That's what happens when you get to excited, your penis will get bigger."
"This is so cool!" Jessica said hugging you again and rubs her erect penis on your leg.
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