Looking for a story where a brother discovers his sister's mind was replaced

[Bluebomber5]

Basically an evil company at the mall is switching peoples minds against their will. The main character is suspicious because his sister and mothers start acting weird. His sister is normally mean to him but suddenly she is being nice. He tests his theory by acting like the two of them were incestuous lovers in the past (they weren't), and of course the "sister" goes along with it thinking refusing will blow her cover. I have tried searching for this story but with no luck. Does anyone know the author or name?

 

[Bluebomber5]

I'm still looking for this story. I have some more details if it helps, but their spoilers. The company doing the mind switching is doing it because them were paid by rich customers who were dying to preserve their minds and eventually find them new bodies. The person who is put into his sisters body actually fall in love with the brother and end up helping him get is real sister and mother back. In the end they manage to stop the company and put people's minds back.

 

[deren11]

Can't remember the name of the story either... - SPOILER- but as far as I remember it was an (arcade)game that they used to switch minds/bodies and at some point most of the characters/villains tried to get the main char. to try out this game...

 

[Bluebomber5]

From what you describe that does sound like the story I'm talking about. Well at least I know I didn't dream it. Gah this frustrating, if only i hadn't forgot to add it to my favorites.