Take a moment to relax

You lean your head back on the couch, your stepsister's rigid body somewhere above you. Your head is spinning, still lost in the haze of sex and disorientation that being in this body has put you through. Closing your eyes, you take in a deep breath but gag as you're assaulted by the smell of semen.

"Get this shit off my face..." you mumble. You sniff again and smell the leather of the couch you're leaning on. Putting your hand on your face confirms that all the jizz has left into the ether. If you weren't in your current state of mind you would find it spooky, but the way you are you're just glad. You smile and your head lolls to the left, coming to rest against the soft flesh of your sister's spent cock.

You flinch back, but the sensation of touching the member is enough to reignite your drive. You groan, half in frustration, half in desire, as you feel a heat begin to ball itself up in your gut and on the edges of your lips.

"Okay, at least I can get rid of this." You focus on the metal band and speak. "I don't want to suck dicks any more." A few seconds pass, but the urges are still in you, and growing. "I really don't want to suck this dick." Nope, nothing going. You think for a second and try: "Sarah doesn't have a dick." Sure enough, faster than you can blink, the dick next to your face is no more, replaced by... yep, everything looks okay up there. You're not sure how seeing your stepsister's vagina makes you so much more embarrassed than seeing her dick, but that's the case. "Sarah's wearing panties, too." There, everything's good. You can feel the urges starting to quiet down, though they're definitely not gone.

You wonder why you couldn't get rid of the urges on your own. Sarah probably knows. Asking her probably wouldn't be so hard, just a command like: "Sarah, answer my questions when I ask them to you." You wait a few seconds, and when nothing goes wrong you continue. "Why didn't my first command work?"

"You can't change yourself." Her voice is her own, but it sounds weird somehow when only her mouth is able to move.

"Why not?" you ask.

"Dunno. Maybe it messes with the band, or maybe whoever made it thought it was too easy."

"Who made it?"

"Dunno."

"Where'd you get it?"

"I... don't remember."

"What do you mean?"

"I just woke up one morning and it was there."

You think for a second. "Sarah knows how she got this thing." The device whirs and delivers a small electric shock to your arm. "Ah, shit!"

You're starting to feel a tickle in the back of your mind that tells you it's time to go out and find a cock to suck. "Okay, here," you say, being careful to phrase the command perfectly. "Sarah, when I give you this watch, you'll wish for me not to have the urge to suck cock, then give it back. You won't do anything else."

You reach the watch out to Sarah, who grabs it, says the wish you told her to, and gives it back. You snatch it out of her hand, not ready to take any chances. But, sure enough, you don't feel anything telling you to stick a dick in between your lips. You can even run your finger along your lips without feeling like you're going to sexually overcharge.

Finally completely relaxing, you collapse limply on the ground, arms splayed out to your sides. Your mind begins to wander.

"Hey, Sarah. Why'd you do this in the first place? Not even just the making me into a sexbomb bit, why've you always been this way towards me?"

She's silent for a few seconds. "Shit, your command won't let me lie. It was jealously, mostly. You came into the family and you were pretty much the perfect kid, my dad liked you way more than he did me. Any time I fucked up it was all, 'Why can't you be more like your brother?' Honestly, the worst part about that was that you were instantly my brother. I'm still your stepsister. Anyway, I sorta made it my personal project to mess up your life. It was the only way I could feel good about myself. I guess that's kinda fucked up but what are you going to do. This was along those lines, except I went way overboard since I could always turn everything back to normal. Which I was going to do, by the way. Eventually. Probably."

You sigh and turn your head to the side. It's not that you feel sorry for your stepsister, but you do feel like you understand where she's coming from now. Standing up from the ground, you look down at your sister's body, clothed only in plain black panties, thrown back against the bed, unmoving. You stretch your arms, which calls attention to the prominent swell of your breasts. Oh, right. You should get out of this body.