Based on original idea of @angelasurfcity
“Ey Will look, I found a perfect prospect. You’re going to love it!” Heather said enthusiastically, entering the room.
Will looked away from the computer and saw his wife with a subtle look of weariness. "Love, are you sure about this?” he said.
“Darling, I swear to you that if it were up to me, everything would stay like it is now,” said his wife with an affectionate tone, “but if I don't do this my life is reduced to two options… living locked up forever or risking merging myself with anyone anywhere.”
Will looked down and nodded. He knew that Heather, his beautiful 35-year-old wife, had belatedly manifested her mutant factor. A routine health exam four months ago slipped the first hint of a latent mutation. After more exhaustive tests, the diagnosis was decisive: fusion-type mutation.
At first, Heather panicked. She knew that a simple contact with some other woman with a similar factor would cause them to merge in random and unpredictable ways. For several weeks she was kept locked up in her house avoiding contact with any other woman, without her husband being able to offer any solution.
However, Heather surprised Will one day with an idea. She would find the woman to fuse with. She had been searching in different internet forums of women with the same problem and had discovered that the search for compatible fusion partners was becoming common. Now, after several days, Heather announced to Will that she had found someone.
"You will really like her for sure, she is younger and very pretty," Heather said with a strange naturalness, "We have been talking for a week and we have almost the same tastes. We will be a perfect complement.”
“Honey, I can't not be nervous about this,” Will said, “We are talking about something that we do not even know what the outcome will be. You may merge completely into another being, or you may become conjoined with that girl. What is going to happen to our relationship?"
Heather looked at him tenderly and said, “Darling, I've already talked to Marie about this. I sent her some pictures of you and she found you quite handsome. If we merge completely, the resulting girl will still have feelings for you, and if the merger is not total, Marie already said that she is definitely interested in you,” she finished with a sexy look.
Will was not sure how to feel. On one hand, he was practically about to participate in a threesome with his wife's full consent, but on the other hand they were talking about introducing a strange person into their relationship permanently.
"Honey, it's your body and your life," Will said, "I will support what you consider best."
Heather walked over to Will and cradled his head against her pretty breasts. "Easy honey, I assure you it will be for the better. I am sure that whatever my combined shape is, it will be very beautiful," she said looking at him tenderly.
Two days later Will asked for his vacation days and started the trip with Heather to Port Solei to meet Marie. As an attempt to avoid Heather's contact with other women that could trigger the fusion, they used their car for the journey. Luckily, the coastal city was only a few hours away.
Upon arrival, they could notice that the percentage of mutant women was higher than in their own city. It can also be the fact that Port Solei's permanently warm weather meant the girls could wear clothes that do not hide their bodies.
They finally reached Marie's house, which was near the city bay. Will could tell that Heather was obviously nervous and could not blame her. After all, she was about to share her body with someone else permanently.
“Will, you can go first,” said Heather, “I want you to meet her first. If it seems appropriate, then I will proceed."
"Love, I already said it was your body and your decision," Will replied.
"Still," Heather said firmly, "if we're going to stay together I want to at least know that you approve."
Will got out of the car and rang the bell. He heard a jovial "I'm coming" from inside the house and a few seconds later the door opened.
In front of him was a pretty girl who must have been in her late 20s. She was dressed casual, with denim shorts, a white T-shirt and pink sandals. Her hair was slightly lighter than Heather's. Both her appearance and mannerisms reminded him a lot of his wife when she was that age.
"Oh my God! You must be Will", she said surprised, "You must forgive me, I thought you would arrive in an hour and I'm dressed like this"
"Easy Marie, you're fine," Will said. So far, Marie had made a good impression on him.
Marie went to the car and greeted Heather warmly through the glass. At first glance, he could see that they will be okay. Seeing them interact, even through the car window, made him feel more at ease. He could see that Heather said something to Marie and she nodded.
"Will, I need you to come inside my house with me first," Marie said in a determined but kind tone.
Will followed her without much resistance. Marie's house had a certain decorative resemblance to their own home. Every minute there showed him more similarities between her and his wife.
"You and Heather seem to have similar tastes," Will exclaimed with some relief. "I wonder in what other ways you and her..." he could not finish the sentence before Marie kissed him deeply and surprisingly.
Will took a few seconds to compose himself and pull away. Marie looked at him smiling.
“Stay calm darling,” she told him with a sultry smile, “Heather agrees with this, in fact she suggested it. I confess that I was nervous too, but after meeting you I think we will get along very well.”
Will instinctively tried to curb his impulses at the sensual young woman's caresses, but finally gave in to her sensuality and the idea that she and his wife would soon be one person. A few seconds later, they were both on the carpet, naked and having sex.
"I can see that both of you are having a good time." Will heard his wife's familiar voice, she laughed aloud at her husband's panicked face. "Silly! I asked Marie to do it with you, she and I will be one soon, remember?"
Marie, still covered in sweat, approached Heather, who began to undress. Her curvy MILF body was in sensual contrast to Marie's youthful body.
"Are you still sure about this?" asked Marie.
"Absolutely," Heather said decisively, "and you?"
Marie did not answer and just walked over to Heather, hugging her. Will quickly regained his "lift" when he saw the two beauties embracing. Soon he noticed the air temperature rise, as if he were in a sauna.
"I'm feeling it, I'm starting to feel how we fuse together," Marie said cheerfully.
"I feel it too!" Heather said, "Oh god, this is going to be fabulous."
Will could see both bodies melt before his eyes. Side by side, he watched as his wife's left leg merged with Marie's right leg, in a cute and strange amalgam of mid-leg. Marie's breasts moved just below his wife's, just as her arms reshaped under his wife's too. Their combined torso, slightly broader than his wife's, now had both heads between their shoulders, whose faces reflected an intense ecstasy at the shared sensations.
"Oh my gosh, this feels so much better than I imagined," Heather said ecstatically. Will watched as the skin of both women matched perfectly, Heather now looking younger and Marie slightly more mature. Their shared body exuded sensuality.
"I... I think I'm going to have an orgas..." Marie said narrowing her eyes. It was evident that Heather was also on the verge of climaxing.
In addition to the extraordinary fusion, Will noticed with surprise how the fused mutant's nipples grew into the shape of penises. They immediately took each one in one hand and stroked them hard. It did not take long, powerful jets of cream? Were ejected several feet away, in unison with powerful squeals of climax from both girls. Once the nipples were emptied, they returned to their normal shape and dimensions.
In front of Will was one of the most fascinating and sensual creatures he had ever seen. Three beautiful legs, a vagina in each crotch, four generous breasts, four arms and two beautiful heads, trying to catch their breath after what seemed like a life-size climax.
"Heather?" He asked, "Are you okay?"
"Yes, I am," Marie's head replied. Immediately the heads of both girls opened their eyes and said in unison “Hey! You used my head to answer"
They both looked at each other and laughed.
"This is great," Heather's head said, "I think we're partially mixed up on a mental level too..."
"…And it feels amazing!" Marie's head continued, "And the dicknipples! It really was an exquisite touch."
"So is everything okay girls?" Will asked, fascinated as much as he was excited. The beautiful conjoined women could see the "tent" their husband has pitched in his crotch and smirked.
“Oh sure, everything is fine Will” both heads spoke at once, “but it's about time for you to debut your new wife… we hope you have the energy, now you have two vaginas to satisfy,” they said pouncing on him.