"Now I think-- woah..." Maddi was suddenly overcome with a wave of dizziness, and everything went black for both of you. When you woke up, you were back to your old male, naked self - aside from having a vagina instead of a penis, of course.
"I'm back.. Maddi, are you still in there?" you ask as you poke your new sex. Maddi groggily comes back around.
"Awww no... why did this happen?" she whined.
"What did you ask the amulet for earlier?" you ask, trying to figure out what had happened.
"Um..." she thought back for a few moments. "I asked that we'd reverse sexes and switch between controlling body and genitals sometime after we orgasmed."
"Ahh, so that's what happened.... That wish was so vague, it takes affect whether we orgasm as a human or a genital. And since it didn't specify to only switch once, we'll likely keep switching shortly after we orgasm."
"Aww, I thought I had you. Oh well, that's still kind of cool, I guess. Still, can we go back to normal now? I've got work in a couple hours and I need to get ready."
"Alright," you say. You hold the amulet and wish you were both back to normal... a couple moments later, nothing's changed.
Maddi starts to get nervous. "What's taking so long? Why haven't we changed back yet?"
"I.. I don't know. I'm trying to change us back into seperate people but it's not working..."
You get out the amulet's instruction booklet. Whoops, you started on the spanish side... you flip it over, then look out the Troubleshooting section. You find one hand drawn downwards, and you idly caress Maddi as you read..
"H-Hey! Focus on changing us back, you perv!"
"Sorry, I can't help it, you're fretting and squirming so much down there you're making me horny again."
"Ah.. sorry. I'm just worried.. I'll try to calm down."
"Oh! I think I've found something!" you exclaim. "Under the question 'Why is the Amulet not reverting changes' it says... 'Caution must be used when fusing two or more beings into one. The amulet has only a loose memory for identity, and will treat all further requests from the combined being as an individual, singular entity. Requests are highly limited in this form, and it is not possible to safely split back into multiple beings, and as such, the feature has been disabled as a fail-safe. Furthermore, any transformations must take utmost caution when changing only one designated part of the body, or else the consciousness residing in that part may perish. For instance, when combining into a two-headed being, a wish that affects only one head runs the risk of destroying the consciousness inside due to the amulet's limited understanding of personal identities. Any wish must be made to affect the full body and all consciousness in the combined form, so the amulet safely extracts all souls of the body (ie. 'blacking out', 'dizziness') during transformation process being putting them back in.'"
There's a brief moment of silence between the both of you before Maddi dare speak. "So.. we're stuck together..?" she squeaked softly.
"I think so..." you say. "And that last part means if we make a wish to, say, turn you back into a penis while I'm male, you might die..."
"I don't want to die..." she whispered.
"I don't want you to die either, and I don't want to die if you change me into a vagina when you're in control.."
You flopped down on the bed and stared at the ceiling, trying to think of a way out of this mess. But nothing came.
For the foreseeable future, your fate was to switch between being a "cuntboy" with your best friend trapped as your new anatomy, to being the penis of a "dickgirl" and back and back again whenever you both came.