Martha went about her usual business during the week. however, she had to once again make changes in her week to accommodate her new growth. she would find that she would suddenly get erections whenever she was aroused so she had to constantly make sure nothing was showing, especially in public. one day she had taken peter to the pool and had to switch from her regular speedo to a pair of trunks that perfectly outlined her cock while it was both soft and hard.
once she was out of the changing rooms she and peter went into the pool. while swimming she noticed it was becoming much easier to move fast in the water. unbeknownst to her, her muscles were becoming more defined, starting with her ass which lost all its fat and became 2 slabs of pure muscle. while she kicked her legs their muscles grew to that of an Olympic swimmer. soon her abdomen became toned now showing a distinctive 6-pack. her arms increased with muscle as her hand grew larger to compensate. at this point, the muscles had completely filled out her feminine frame making her look more masculine.
the only major thing that made her a woman was her c-cup breasts. however, that wouldn't last long as her pectoral muscles pushed out. her breast slowly shrank as she swam. They soon became b-cups which caused her bikini top clasp to snap and float off her chest as she swam without her even realizing it. her breast continued shrinking soon becoming a-cups as she played tag with peter. Eventually, her breast completely vanished leaving nothing but manly pecs in their place.
then after it was getting late so she and her son got out of the water. while she got out she heard a girl say to her "nice muscles dude". which confused Martha before she looked down in shock. gone were the beautiful curves of a 28-year-old mother, now her body looked like that of a male Olympic swimmer. she didn't correct the girl and went to the changing rooms. however this time she followed her son into the men's changing room. she saw that the only stares from the men were directed at her head, 'why does that man have a woman's head?' she figured they thought.
weirdly her cock and balls felt more natural with her new muscular frame. she soon called the lab when she was back home. they told her that the reason that she was becoming more male was because of the Y chromosome which causes testosterone to flow through her body and become increasingly manly. the only reason that she wasn't already male was that she still had 2 X chromosomes which had her body still pump estrogen through the body. though with each test her testosterone levels increased which is why her body was slowly changing.
afterward, Martha relaxed her new body in the tub, her cock sticking out of the water like a buoy in the ocean. once she got out she got out her breeding mount and cummed into it. afterwards, she made food for the 2 of them and laid down and fell asleep.