Despite her sudden takeover and enjoyment of what your body offers, it seems Heather hadn't totally forgotten that you you were still considerin conscious inside of her--well, inside of yourself. In an attempt to thwart her control, you desperately attempted to wrestle with her movements to get her to stop, since you couldn't just demand it out loud. You were horrified to find that the best you could muster was slight twitches and spasms, causing Heather to laugh at your predicament.
"Aww, does brother want to play? That can be arranged. I can control everything about you, it's like a playground in here! Watch." Heather positioned you in front of a mirror, where you looked similar to your normal self. You could feel something slide out of your arms, as Heather was retreating inwards. Finally! You could move your arms again! That was all though, as Heather smirked with your lips.
Suddenly you feel a pressure in your chest. Something was pushing outwards, and it felt strangely like being pressed by hands. Heather had moved her arms out of yours so she could alter your appearance, and first on the agenda was breasts, roughly the same size as Heather's, pushing against your shirt.
At first you had been busy pulling up your pants when the beasts grew, and you were so startled your hands shot up to feel them. When you first pressed against them you could feel Heather's hands through your large chest, but she quickly pulled away to start working elsewhere, leaving you with two heavy fleshy globes. "I can sculpt you how I want! And I want to see you survive as my sister."
Soon, your hips and ass were straining against your ill-fitting pants as Heather pushed outwards, and she swayed those hips teasingly in the mirror. With a yank inwards, you felt queasy as you lost your maleness once Heather got a good grip from within. "I'm going to let you have control of everything again--well, every normal thing. But i will be having a lot of fun with you still..." To demonstrate, she puts her hands back in your breasts to jiggle up and down, and you gripped them in hopes of keeping them still.
Heather's head pulled down and out of yours, giving you speech again, but your head fills up with Heather's hands, who was altering your face feature by feature. Smoother jaw, bigger eyes, slim nose... By the time she was done, you looked more like Heather than yourself. "I can't believe this..." You mutter, a hand on your face in shock. The only thing you keep was shorter hair than your sister, which still looked cute on your new frame. As Heather pulled her legs up into your torso, you can walk again!
What does Heather do now?