He takes over.

Just as you slide your long thick cock into her pussy you hear him rapid fire off three quick wishes. "I wish you looked exactly like my girlfriend. I wish you had all her knowledge, memories, abilities, and personality so you can act just like her except I wish you loved anal sex."

As you feel your body and mind changing you hear her protest, "What the hell kinda bull shit is that?"

Then as you feel his hand grab the collar he says, "I wish you would take off the collar and forget it exists."

You sit down recoiling from your exact double and ask your boyfriend, "Holy shit she looks exactly like me what is going on?"

She looks at you stunned and then at her boyfriend and demands, "Exactly what the hell do you think you are doing?" He climbs on her and fights to get the collar on her but she puts up a hell of a fight. You watch on in shock as your boyfriend, who can be an asshole at times wrestles with this person that somehow looks exactly like you trying to wrap your head around all of this when you hear her yell, "Damn it don't you dare!"

She is cut off with, "I wish you would sit still and be quiet." He backs off of her panting, "Holy shit she is tough."

"Baby what is going on?" You ask him.

"Don't you remember we found this person with a magic collar that can change how she looks?" He says and rubs you on the shoulder comfortingly. Then he starts laughing, "Oh my god I am so stupid I was about to make a huge mistake. All I needed was one silly wish." He looks at your double and says, "I wish you loved anal sex. Ok now baby I wish you would take off the collar, hand it to me, and forget all about this other than of course the loving anal thing."

She does as instructed then both of you look at each other then at him and ask, "Seriously what the fuck is going on?"

"Girls calm down we were in an accident, you hit your heads, don't you remember?"

The two of you look each other over, she asks, "What? Who is she? For that matter why are we naked?"

"Honey you seriously don't remember your twin sister?"

"I don't have a twin sister?" You say quietly. "Didn't you say something about a magic collar a second ago?"

"Fuck this is getting way to complicated." He looks back and forth between the two of you. "Ugh is there any way to make this work?"

"Make what work?" She asks.

"Ya what is going on?" You ask.

He laughs. "This is like the coolest moment ever but I think this might just drive me nuts. That said the two of you are so hot."

In unison the two of you ask, "What is going on?"