Your Bedroom

You walk down the hall towards the kitchen, checking the side rooms as you go. She isn't in the kitchen either, although you find what must be lunch wrapped in foil. You uncover a portion of mac and cheese and have a few spoonfulls before you recover the bowl and go in search of Jennifer again. You travel around searching the downstairs rooms, and then head upstairs. You head down the hall towards your bedroom, checking the side rooms as you go. You finally spot her in your bedroom sitting on the end of your bed.
She spots you and waves at you from down the hall. "Found our bedroom," she calls out, patting the bed beside her. She slides over a bit as you continue down to her. Her smile lights up your day, and you hurry the rest of the way. You are about to sit on your bed, when you realize it isn't your bed Jennifer is sitting on. "Pretty big, aren't they?" Jennifer is sitting atop one of her huge balls! They are each about the size of one of those large rubber balls people use for exercise. She pats the other one again. "Have a seat, they are really comfortable, I promise," she coos to you. You put your naked ass down on her globe carefully. She giggles at this. "I am heavier than you, if I can support myself, you don't need to be careful. Just make yourself comfortable!" You put your weight on her, and she doesn't seem to mind. You relax after you are certain you aren't going to hurt her.
"These really were growing the whole time, I wouldn't believe it if I wasn't sitting on one right now," you mutter in awe.
"I think they are done now, and about time, right? What would I have done if they had gotten any bigger? They are just the right size now. Large enough to sit on, but small enough so I can still walk around fine. Actually, I'm lucky they stopped sagging down when they did, they are only an inch above the floor when I'm standing. Here get up I'll show you." You get up and so does Jennifer. It looks how she said. Her giant sac hangs but an inch from the floor. They definately expanded outwards though. They jut out a good three feet in front of her, not counting the part between her legs. She turns slowly. "So, what do you think?"
"Too small, make 'em bigger," you joke.
Jennifer giggles, "Well, they might expand a bit more when I'm horny, but how much they shrink after I cum is unknown so far." She walks around a bit for you, her giant ballsac bouncing along with her step. "So, watch now. Swing your hip," and she swings her right hip out, her large buttcheek swinging out with her, "and then step hard," and she does. Her right buttock quakes. Then she repeats with the other foot, to the same effect. Then she takes a few more steps at a normal pace. Her ass-cleavage distorts as her cheeks collide and bounce and jiggle in every direction as she walks. Then she turns, and walks back to you, her sac swaying and jumping as she walks, her breasts rippling, her cock swinging wildly all over. "You try now. Remember, accentuate your sway, give it your all." You give it a try. Jennifer claps lightly. "That's better than before." You give it another go, really making your ass move this time. "Wow, nice. I think you got the basics down now. All you need to do is practice and fine-tune your step. All that ass-talk reminds me, let me fist your ass again. I want to see how loose you still are." Without waiting for a response, Jennifer walks up to you and after running her fingertips around your hole, she leans down and licks around a bit to lube your no-longer-gaping butthole. You stand up taller and spread your legs reflexively. She giggles at that. After a few seconds she gets up and proceeds to make sure your asshole will be gaping for a long time. You enjoy the sensation as she enters you. She starts right with her fist, which pops inside of you easily. She pumps in and out for a few seconds, then begins sliding her other hand in next to it, going one finger at a time to make sure you are still loose enough. She does this quickly as she meets no resistance, and then her second fist joins her first after restretching you a little bit. She pumps in and out of you with both hands, going on for 15 minutes straight. She swings her leg over, and sits down on her right ball. Then she keeps going for another 15 minutes. You love the feeling. Two fists in your ass, and you aren't even bothered.
"Stretch me some more, this is getting boring," you comment with a mock yawn. Jennifer giggles, and pushes her fists inside you farther, up until she starts to meet resistance as her forearms enter you. You feel yourself stretching again, but it's gradual this time, not a whole fist at once. She fucks herself into you as deeply as possible, pushing your limit a little each time.
"Hey, you started without me? Why didn't you wake me up." Kako is standing in the door pouting. "You got all the way up to your forearms. What a man! And speaking of which, wowzers, look at those nuts!"
"Have a seat, we are just getting started," she pats her left testicle, and Kako plops her soft ass down on it.
"Need a hand?" Kako asks, and without waiting for a reply she jams a few fingers inside you. You get that feeling of being super stretched again, and do your best to open yourself for the third fist. "Pull your arms out, I can't fit in there with you all the way in like that." Kako works her third fist into you easily. She picks up her cockhead with her other hand, and asks, "Hey, deal with this ok?"
"Sure," you reply. Anything to take your mind off of the uncomfortable feelings that are sure to follow. You rub her cockhead with your hands, teasing her.
"How about another?" Kako starts working her other hand into you. The feeling is very uncomfortable. You do your best to distract yourself by playing with Kako's cockhead. It is the size of a volleyball you estimate, but very plush. "Uh, better aim that somewhere, cuz I am about to cum!" You shrug, and put your mouth at its tip to accept your dinner. "Yea, good idea...drink...THIS!" She pumps her first shot out, and you are ready and gulp it down. You keep rubbing her, and as she cums, she is jamming her fist against your opening hard. It hurts, but Kako is cumming; she won't regain her senses for five minutes. You just try to focus on gulping cum until she pushes her fist into you finally with a white-hot stab of pain that makes your eyes water. Then she starts jerking her fists in and out along with Jennifer's, causing more pain. Four minutes to go still you figure after gulping down 15 shots of Kako's semen. The longest minutes in your life pass, as you gulp down 30 more squirts before the pain subsides into a dull throb. 30 squirts later, she starts to come down from her orgasm. You sigh in relief. Your stomach hurts from the sheer volume of cum you just ate.
"I told you it was fair game," Kako giggles.
"We need to keep these in for another hour at least," Jennifer says. "Can't let that go to waste."
The doorbell rings. You straighten up. "Uh, yea, I guess I'm not answering."
"That would be rude," Jennifer says in shock. You sigh and head downstairs with 4 fists inside of you. You feel your ass cheeks spread wide by the four fists inside of your ass. "Well, come on girls, practice time." You use Kako's cock like a boa, teasing the girls as they walk behind you. They watch you move and cheer you on and give you pointers. After a bit you state, "Hey, the pain is gone."
"If you had tits and a womanly ass, you could be a model with how you move. It's that good," Jennifer tells you breathlessly. "Do it some more, while we loosen you up some more." You shrug and agree as you reach the bottom floor. The girls fuck your ass with their four fists as you move sexy for them and revel in your power to turn them on.
You open the door to see Mrs. Barstone with her two daughters, Violet and Judy. Both look ready for a fucking. Violet, the youngest at eighteen, smiles as Jennifer and Kako turn you sideways by the ass so your guests can see your quadfisted ass.