"Harder! HARDER!" I shouted at my girlfriend as she fucked me silly with her new cock, blissfully unaware of the side effects of the magic. The change in our bed dynamic was a welcomed one as I had never felt like a truly dominant person but now that she sported a dick larger than mine. I screamed into the pillow as she made me her bitch, hoping this moment would never end, ignorant of my wish coming true.
She kept pumping me with an unwavering ferocity, enjoying it just as much as I was. Both of us were too swept up in the moment to notice when her penis began to stick. The sound of her balls slapping against my ass disappeared as my bottom half merged into them, enlarging them as they did so. My body began to be pulled with her, shaking me as it did so. My face hit the bed as my arms were forced to my sides, merging into my torso. Only then did I notice something was happening, but it was too late.
I tried to yell something but found my mouth unable to make noise as my lungs were consumed. I felt myself shrink albeit not much as veins ran the course of my body. My mouth was forced open as it repositioned to the center of my face, turning into a vertical slit. Salty drool dribbled from my shrinking lips as the rest of my facial features faded away. With a few final changes, my body was fully subsumed by the cock, growing it with the matter my body provided. She grunted with pleasure as my mouth was forced open, spewing a gargantuan load out of it and onto the bed along with the last remnants of my humanity.
----------
Picture by WuJack2211