New old girlfriend

When you regain consciousness, you find yourself lying next to your passed-out girlfriend. You freeze in shock seeing a very obvious change: Her skin turned red. Bright red. Only her lips and nipples became of darker, brownish color. Not only that, her tits, which already were nearly damn perfect, became even rounder and larger! Her hair remains dark brown but her head gained another surprise, a pair of small cute horns.

"What... the fuck?" You mutter to yourself, trying to process the changes. "It can't be real. It just can't. It can't. I must be sleeping. Yes, it is a dream."

Despite telling yourself that it's a dream, you can't help but reach out to touch your girlfriend's new red skin. It's smooth, soft, and way warmer than normal human's. It is as if she is in fever but her sleeping face is too serene and her breathing is too calm to assume that she is somehow sick. As if to confirm that she is OK, she smiles in her sleep showing yet another new feature: incredibly white teeth with fangs that make her look sexy in a new, dangerous way.

You notice that the ropes have disappeared as well as all the candles. As for the pentagram underneath your two bodies, it is still there but somehow it changed, too. It is now filled with symbols and runes that you can't understand. And it looks not like cheap paint designed to be washed away easily but a permanent addition to the floor.

You look over Carrie's body once more to find more changes. There is nothing major: no hooves, wings, or tail. She seems to be more athletic, with no body hair left and... yes... no belly button as if she wasn't born human. Despite that, she is still recognizably her. Just improved and enhanced as if some artist improved an already beautiful painting.

Her pussy has also changed: more compact, more symmetric, more juicy looking. Dark brown lips surround a slightly open entrance that looks welcomingly wet. A twitch in your dick reminds you of the recent pleasure that ended with? You don't quite remember...

You shake your head, trying to clear your thoughts. This is impossible. None of this can be happening. Magic does not exist. Demons do not fucking exist. But the end result is very close to what the ritual described, minus dark wings and a long tail.

"Carrie?" You whisper, gently shaking her shoulder. She doesn't react. "Carrie, wake up!"

She opens her eyes, showing yet another small change - yellow irises with black slit pupils.

"What happened...?" She moans, her voice seemingly unchanged "Did you fucking fuck me into a fucking unconsciousness? I don't remember the last moments... only pure bliss."

She seems to be unaware of any changes in her appearance and you don't quite know how to tell her.

"Um..." You start, not knowing what to say.

"What? And what the hell with the lightning? And your skin? And... " Her new eyes must be seeing the world differently as well.

Not knowing how to save it with words you take Carrie's hand and bring it to her face.

Shock hits her face. "Something happened with my eyes! All colors are messed up."

"It is not your eyes... Or not only your eyes." You say and put her hand on her horns instead of trying to explain verbally.

"What? What? Is it? Did it fucking work?" She is taking it better than you expected. If you were in her place you would probably be screaming.

"Yes..." You answer. "I mean... I think so. Or I am having a fever dream.

"This is why I am feeling so horny. Fuck me and we'll find out what actually happened later. I need this."

Her disregarding life-changing transformation and asking you to fuck her makes you worried about her mental state. Also, you have heard that sex with succubi may be quite deadly... After all, you have a vague memory of something unpleasant that happened at the end of the transformation