Get your sister to change you back, ASAP.

The heat outside is sweltering, and sweat is beginning to coat your body. You look down and your white blouse is soaked through, showing the black of your bra underneath. Looking down at this body you've been **** into fills you with a sense of overwhelming discomfort. When you pay attention to it, every motion in this body feels unnatural. Even not moving at all, just existing weirds you out. You need to get out of this body. Fast.

"Okay, Sarah, stand up," you say to your semen-covered sister. "You don't have to act like a dog anymore. Now, when I give this to you, send me back to my normal body, and give it back to me."

You hold the device out. It takes Sarah a second, but she nods slowly and extends her hand out. You place it in her hand, and she grips it tightly. She's silent for a few long moments, then says, "Send my brother back to his normal body." She gives you the device and you take it back.

As soon as the weird metal bracelet is back in your hand, you know something's wrong. For one thing, your stepsister is smiling. That's never a good sign. Also, you're still in this sexualized office lady body. You open your mouth to ask Sarah what's going on, but what comes out is: "Erase all the changes I've made to Sarah." Your hand stretches out, holding the device out to Sarah who takes it.

Fuck.

"My brother can't hold the device! He can't speak or move away from the spot he's at!" She shouts commands as fast as she can and before you can muster a resistance you find yourself unable to speak or will your feet forwards. Seeing you unable to move or talk, Sarah holds her arms above her head. "Yes!" she shouts, jumping up and down, arms above her head. Doing so flings some of the semen off of her face and shakes her smallish breasts around in the warm air.

"Shit, I forgot about the semen. Fuck you, bro, you're an asshole. What's your deal? There's no semen on my face." The semen disappears from your sister's face. "And I'm wearing clothes, too." Nothing happens. "Wait, that applies to clothes, too? That's so dumb. Okay, what about, 'my favorite outfit, minus the panties, is on the ground right in front of me'?" A few clothes appear, laid out in front of your sister, who groans as she picks them up. "This thing is stupid."

Your sister starts to get dressed, pulling a light blue bra over her shoulders and clasping it behind her. "You forgot to tell me not to give any commands in my head, bro." She picks up a pair of jean shorts. "Which is surprising because that's how you got that thing back from me earlier, but I'm not complaining." She pulls the shorts up until they fit snugly around her firm ass, then bends over for a pink tank top. "I guess you just weren't careful enough. Granted, I wasn't, either." She pulls the tank top over her head, stretching it across her midriff, then shoves her feet into the strappy sandals, leaving no clothes on the ground.

"Oh well, you lose. And I'm not making any of the same mistakes you did. Let's see, you can't touch it, what else... Oh, you can't tell anyone else about this 'watch', either." The device is disguised once again as a watch on her wrist. "You have to do everything I tell you. That probably covers it. I guess I could be safer if I changed your personality, but I'm willing to put up with a little risk to make sure it's you that I'm messing with."

She walks up to you and you desperately try to take even a step back to no avail. Sarah stands in front of you and reaches her hand up to your breast and begins to grope it, lifting it up against your body. "This feels pretty nice, actually," she mumbles, kneading the meat of your tit. You purse your lips and try to endure it, but pleasure starts to radiate out from your chest, traveling like fire across a nerve straight to your crotch. On reflex, you bring a hand up and smack your sister off of you.

Your sister sighs. "You really don't get it, do you? How deep you're in over your head? I was gonna wait and let you have a bit more of your Spring Break, but I think it's about time you got back to work, don't you? Me too."

Your sister grabs the device in one hand. She's silent for a few seconds and you realize she's giving commands in her head. You close your eyes and brace yourself for whatever's coming.