Mary felt good letting her headless body pleasure itself, and it was hard to think clearly, but even still, she also felt too vulnerable sitting on the couch without a head for however long it would take the vial to wear off (assuming that it did!).
She remembered seeing a Head+ vial next to the Head - vial which she had ingested, and she assumed it was intended to either reverse the effects of the head erasing vial which she took (or maybe also grow a second head?).
She summoned all of her remaining will to try to control her headless body, and with great difficulty, forced one of her hands to find the Head + vial next to the empty space in the tray from which the Head - vial came. It was hard to draw her body's attention away from feeling up and down her skin, teasing her clit, and sliding its fingers in and out of her pussy; without a head her body apparently had an endless sexual appetite. Mary couldn't imagine what it would have been like if her boyfriend had been there.
All the same, she managed to find what she was fairly certain was the right vial. If she had a mouth, she would have taken a deep breath at what she was about to do: she certainly would have never tried to do something like this under normal circumstances.
She uncorked the vial with the thumb of the one hand she was willing herself to control, careful to keep it upright until the last moment, and lowered between her legs. Her pussy was soaking wet, wetter than she thinks it had ever been, as her other hand (under her headless body's control) worked in and out. She forced her other hand aside with the neck of the vial, and inserted the vial's head into her vagina, and poured in the contents of the Head+ potion.
Mary immediately felt a rush and then a series of convulsions in her pussy, culminating in an intense, wet orgasm, then a sensation like static, and more darkness. She then opened her eyes.
It must have worked! She looked around and saw two huge pink falls of flesh to either side of her face.
"What the fuck?" Mary exclaimed. Well, her mouth worked---though it had a bit of weird taste in it.
She struggled to stand up, and as she did, she felt her face move, and saw that her perspective was very low to the ground, like she was kneeling. Before she even saw her reflection in the blank screen of her flat screen TV, she realized what had happened:
Ingesting the Head + potion through her pussy had transformed her pussy into a new face. Her eyes, nose, and mouth were now between her legs, and her head and neck were still blank skin.
"At least I'm back in control of my own body," she said to herself, testing her hands by rubbing them up and down her still somehow very aroused, naked form. "And I can see and hear."
"And I guess I can think clearly," she thought. "I just feel like ..."
Mary felt like sucking a cock, is what she felt like. She almost laughed at the realization. Mary had never really enjoyed giving blowjobs, and her boyfriend, John, rarely asked her to do so, or pressured her to do so, since he knew she didn't really want to .... but all of a sudden she felt like if she wasn't sucking on a cock, she would somehow starve to death.
She reached for her phone and positioned it between her legs, and texted her boyfriend: "Come over right now!" plus the eggplant emoji.
She licked her lips just thinking about what she was going to do. Luckily for her, her boyfriend did not live far away, and was not at work at the moment.
John had a key, so he let himself in, but froze as soon as he saw her sitting on the couch.
"Mary! I ... something's wrong. I think I'm having a stroke or there's gas in the air or something ... I don't even want to say what I'm hallucinating right now!"
"Is it your hot girlfriend sitting naked on the couch with no head or neck, and her face between her legs where her pussy should be?" Mary laughed (her voice distinctly projecting from between her legs).
John stood silently for a moment. Then: "Is this real?"
Mary rose and crossed the gap between them. Her eyes being at crotch level, she could see clearly through his trousers that he was getting hard. She slipped a hand down before he could react: "You like?" she asked.
Before John could ask much more about what was going on, his pants and boxers were down, and Mary's mouth was full ....