So. Results in comments. Charles ended up in the body of his female version of his named Sherrill. She is married and works as a secretary. He had never seen her husband before and for him this is a complete stranger. With her body, he also received all her knowledge and lost his. A few days later he will return to his (?) Reality, but for now he has decided that he will pretend to be Sherrill.

Start: www.deviantart.com/vfrcbvvfrcb…

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... Sitting on the bed and still feeling a slight sexual arousal, he stared at the satisfied man, who, instead of lying next to him for some reason, got up and began to gather somewhere.
Charles watched the man intently and was convinced by the second that he had never seen him before. Long years of work as a special agent taught him to always be a professional. Therefore, even in such an incomprehensible situation, Charles tried to remain calm as much as possible. It was difficult to act as usual. The unusual sensations of the weight of the breasts and the still vivid memories of the first sex with a man in his life were still too bright an emotional stain in his mind.
- Cheryl, why are you staring at me like that?
Having quickly said this, the man continued to dress, but he took some things and threw them to Charles. After taking a sip and taking in a full chest of air, Charles closed his eyes tightly for a couple of seconds while holding the caught clothes in his hands. Opening his eyes again and making sure that all this did not seem to him, he began to examine what was in his hands.
Plain gray sleeveless T-shirt. Suddenly, a bra with a large cup flew to him, apparently from the filing of the same man
- Cheryl, fuck! So are you going to sit and look at me or make me a fucking breakfast !?
Looking viciously at the man, Charles understood that he could not tell the truth. One way or another, he must pretend to be this woman for a while and not spoil her life. This was agreed in advance and Charles understood that whoever he was in a parallel universe, he had to pretend to be this person. But he could not think that he would get a woman's body and at the same time be fucked by some man.
Looking at the bra and turning it a little in his hands, he began to put it on, feeling the cups of the bra touch the skin of his new assets in the chest area. It's strange that it came out very easily, as if he always did it, but at that moment he did not pay attention to it.
Obviously, it was already that the experiment was a success and he really turned out to be in a parallel reality. This means that when he returns, he will be a hero. He will not have to tell anyone the whole truth. It was only necessary to live a few minutes in this body.
Dressed to leave the room, he paused for a second to receive another disgusting kiss from this man and a slap on the ass. Hating everything around him, he left the bedroom and headed for the exit. But he stopped at the wall with photographs, which had a photo of this man and some woman. Looking closer, he discovered a surprising resemblance between her and him, she had almost the same face, only with feminine features.
- Cheryl! I want to eat! I need to go to work! Come on get your ass to the kitchen quicker!
A voice came from the next room. Charles guessed that, judging by the photo, it was Cheryl's husband. And Cheryl was the female version of Charles in this universe. Overwhelming his desire to send this asshole to hell, he headed into the kitchen.
His thoughts were filled only with the idea of ​​making dinner for this idiot faster and for him to dump faster. Trying to ignore the unpleasant pressure of the bra straps with the new weight of the chest and the touch of the tousled long hair, he began to cook. The realization that it is not difficult for him to find the necessary dishes in this house and that he knows exactly what this man likes came to him suddenly.
More than 10 or 20 minutes had passed while he was cooking and while he was watching this asshole eat. He didn't like it at all. According to the plan, he was to come back in five. During this time, he had already managed to find out enough and he did not want to know more. Cheryl's knowledge was now like his own and he had to strain to understand that this was not his knowledge. This became clear when he called this man Mark several times and only then realized that he never knew it, although it seemed to him that he always knew it.

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Part 3.1: www.deviantart.com/vfrcbvvfrcb…

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Sketches, alternate versions: www.patreon.com/posts/59959666