App-athetic - Commission (NSFW/Body Part) (Patreon)

This app you found was amazing! It allowed anyone to swap with anything they could imagine! You already swapped with your girlfriend's pants before which naturally led you to swap with her underwear. You continued to do this with and without your girlfriend's consent until you tired of it because it didn't give you the same kick as it originally did. Then you found the "body part" setting and your excitement reignited.

You turned the setting on and clicked through the boring warnings before you were able to get to the good stuff. Thinking about what to possibly turn into, you settled on her vagina because, after all, it was probably going to be the most pleasurable. Clicking the button and setting the timer, you begin your journey as your girlfriend's sex.

You awoke gagged by cloth which turned out to be panties wedged between your new mouth. Even the slightest shifting of your girlfriend left you shuddering in pleasure, but it seemed you weren't the only one. You could sense her libido rising along which brought about the thought she would masturbate. You were so ready for this when you heard a familiar voice enter the room, your voice.

During your initial exhilaration, it turned out your body took on the mind of pussy you replaced. After the initial shock of actually having a body and consciousness, the new mind began to explore the pleasures of humanity and soon heard the moaning of your girlfriend. He quickly took advantage the your unaware, pleading girlfriend and after affixing a condom at her request, began to plow your repurposed mouth.

This was better than you could've ever expected. The warnings probably said something about how this could happen but you were too focused on the pleasure to care. You were a bit confused though when your body took off the condom and seemed to smile... at you?

He thrust back into you which led to a strange shock emanating inside your mind. The feeling passed and allowed you to resume your basking in ecstasy. Both your girlfriend and your body seemed to go for hours until you were too sore to continue so all that was left was to wait for the timer to run out and return you to your original body, but that should've happened by now.

Had you actually read any of the warnings, you would've known that any sort of bodily fluids made the transformation permanent, and considering how much your imposter came inside your girlfriend, it was pretty clear you'd have to get used to your new life. This all began to set in after an entire day passed and you remained in this form, getting fucked by your own cock until you accepted that this was the only thing you were useful for anymore.

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Picture by kuro mushi