This story is the expanded version of a post I made elsewhere.
Katie was home alone, and was waiting anxiously for her husband, Tommy, to return. It wasn't because she missed him, although she did. It wasn't because she needed help getting something off a tall shelf, because she was almost seven feet tall. At first glance, one might assume it was because she was nine months pregnant with octuplets, and needed the help of her strong man. On second glance, one would realize that she was built like a bodybuilder, and more than capable of hefting her belly that stretched beyond her reach, and the yoga ball-sized breasts that rested on top of it.
No, her real problem lay beneath her prodigious belly, hidden by her loose floral print dress. Or it would be hidden, if it weren't staining the bottom of her dress with precum.
As it turns out, Katie was a futanari, and a gifted one, at that. She had a 17" long penis, and it had been hard almost all day. Being a pregnant futanari gave her three main challenges. The first was that her pregnancy hormones made her more horny than usual, and she was usually a very horny futa. The second was that one of her babies was right over her prostate, and every time it kicked, it aroused her member. Finally, her most pressing problem was that the sheer size of her belly made it impossible for her to reach her penis enough to masturbate it. She could reach behind and shove a dildo up her leaking pussy, but she had separate orgasms for her pussy and dick, and dildoes also rubbed her prostate, making her even more aroused.
Katie and Tommy had developed a solution for this: Tommy had rigged an industrial-strength onahole to the side of the bathtub, so whenever Katie got hard, she just had to insert herself into the onahole and thrust until she was relieved. Some days she could nearly fill the bathtub before her husband got home.
Unfortunately, either through over-vigorous use or from resting the weight of her belly on it, this morning the onahole had snapped in half during her first masturbation session. Katie didn't want to bother her husband at work, since he had some important meetings in another city, so she tried to deal with the problem as best as she could.
First, she tried a cold shower. That worked to unarouse her for the moment, but that couldn't deal with the constant kicks from her babies. She tried to think unsexy thoughts, but again, the kicking. Out of desperation, she tried putting a trash bag on her dick and humping the couch cushions, but they just didn't give enough grip.
Although she could go limp from time to time with cold showers, that did nothing for her semen buildup. Katie was also a very productive futanari, and could produce semen at several hundred times the rate of a normal man. It all stored in the balls, too. At their emptiest, Katie's testicles were normally the size of tennis balls. After an hour without masturbating, they were the size of softballs. She could feel them dangling between her legs and bouncing between her rock hard thighs and her belly.
Katie had another problem: she also had a fetish for her own testicles expanding. As she felt them get bigger, she got more turned on.
So Katie did her best to distract herself from her swelling balls. Using her huge muscles, she lugged her belly and breasts around the house, doing all the chores like a good housewife. Many futas were very dominant, and often wore the pants in the relationship, whether they married man, woman, or futa. Katie loved being a housewife, and looked forward to being a stay-at-home mom. Although her unique sex made her over a foot taller than Tommy and gave her the muscles of a goddess of war, she was happy being submissive and still thought of him as the man in the relationship.
But all the vacuuming, dusting, laundry, and ironing couldn't distract her forever. One well placed kick from her baby and she was stiff again, soaking the bottom half of her flower print dress in precum again, and her testicles swelled again. Over the hours her husband was away they swelled to the size of volleyballs, then soccer balls, then basketballs.
Katie couldn't focus. She was covered in sweat and panting. She needed to take the edge off. The cold showers weren't working any more. Her balls were dangling down around her knees, getting in the way as she walked.
She went to the bedroom and opened her bedside table drawer. Inside was a plastic and silicone monster that she used when she got really desperate. She hesitated, knowing that if she came vaginally, it would just make the problem worse. Unfortunately, when one is very, very horny, they don't think straight. She just hoped this would take enough of the edge off.
She slid the end into a suction cup attachment and took it into the bathroom. She twisted the back of the device, starting the buzzing. If she were rational, she might have kept it on the lowest setting. But she was not rational, and put it on the highest setting. It vibrated like it wanted to jump out of her hands. Then she stuck it onto the tile wall.
Normally, she would have inserted it manually, but since her pregnancy had started, her ass had grown as well. Each cheek was also the size of a yoga ball, rivaling her breasts, and her ass was three feet wide. Just like her penis, she couldn't reach her pussy, either.
She leaned forward and pressed her ass to the wall. She had guessed the height correctly, and the vibrator immediately entered her waiting snatch. She moaned with the vaginal stimulation. In a corner of her mind, she noted that her dick was now as hard as it had ever been, and was simply oozing precum.
She bounced against the wall, her huge tits slapping against her belly, her balls swinging between the wall and her belly. She came again and again. At the same time, her prostate was getting constant stimulation, and her balls continued to swell. After a while, she noticed that they were swinging differently than when she had started. She looked down and gasped when she saw they were 12" across! She couldn't remember the last time she had been so big!
She pulled away from the wall, but her pussy had other plans. It pulled with such suction, that the vibrator came off the wall with her. She thrust back, sticking the suction cup back on the tile and tried again. She pulled and pulled, but it seemed that she had become so horny that her snatch refused to let go. She tried jiggling around, but realized her mistake when she felt the vibrator slide out of the suction cup attachment. She looked around in horror at the suction cup still attached to the wall, and realized that there was no way she was going to get the active vibrator out by herself.
She took off her flower-print dress, which was soaked completely through by that point, wrung it out, and put it in the laundry hamper. To avoid messing up the house, she laid down on the cool tile bathroom floor with a rolled up towel under her head to await her husband.
And there she lay waiting and cumming, as the shadows lengthened, and her balls grew. From time to time, her hips would involuntarily thrust in the air at nothing.
After what felt like an eternity, but was more likely 3-4 hours, Katie could hear Simon enter the front door.
"Honey, I'm home!" he shouted. "Sorry I'm late, the meetings went long and traffic was horrible."
"Tommy, I'm in here!" she shouted back.
"Is something wrong love?" he asked, entering the bedroom towards the bathroom, "are you... holy shit!"
