My girlfriend was undressing for bed - a sight I loved to watch as she bent and rolled her panties down her legs - when she suddenly paused, gasped, and jumped up in shock."What happened? Who am I? Where's my dick?" My girlfriend turned to me, a confused expression on her face.I thought she was playing a joke at first but then she repeated the question."Who am I? Where am I? I'm a-- I'm a-- woman!"It was then that I thought she having some sort of episode. Not that this had ever happened before but how else to explain her sudden confusion? Concussion? Sudden onset amnesia?It was explained minutes later when a man banged on the door to our apartment. He explained that he'd been working on a body swapping machine and it had gone off accidentally, swapping the occupants of several apartments around us. I discovered that my girlfriend had swapped with a nerdy guy fresh out of college.The victims would be stuck in their new bodies until the machine was fixed. My girlfriend insisted on staying in my apartment along with the guy in her body. She wanted me to help keep an eye on him. I didn't blame her. The way he was poking at himself I had an idea what he was thinking.The next day my girlfriend jumped on me when I got home. She was so excited the machine had been fixed she wanted to fuck me right then and there. It was only after we had sex that I realized it was still that nerd in her body. I couldn't tell my girlfriend what I'd done. And the nerd was so much hornier than my girlfriend had ever been. He was always down to have sex whenever and wherever. I felt guilty sneaking away from my real girlfriend, but I was falling for the guy in my girlfriend's body and we made a plan to run away together before the machine could be fixed.

A mean-spirited sorority girl is possessed by an occubus, a demon that takes over a person and thrives on their sexual energy, its demonic male essence gradually turning her body masculine while she remains helpless inside in Occubus, available on Body Swap Stories or Smashwords. Preview here. https://bodyswapfiction.com/enter/?p=13853