You lay back and relax.

"You have me turned on plenty. I have a lot of milk for you." You lay down on the carpet and motion the girls to you. Judy eagerly climbs onto your huge breasts and then turns away from you.
"Can you aim for me?" Judy asks as she spreads her butt. You rub your leaking nipple around a bit then plant it firmly at her hole after pulling the bathing suit material to one side. She sighs as you watch her hole open for your nipple and then watch it disappear as she slides down to sit on your breast. She sits patiently while she waits for her sister. "Like the view of my ass parted by your fat nipple?" She giggles.
"He's a perv, you know that Judy," Violet answers for you. "You want me the same way, then," she states. She climbs on your other breast and faces away. She spreads her cheeks and you lube her up. Her suit material is harder to slide out of the way. You give it a good tug (which illicits an 'Ow' from Violet) and slide your nipple into place.
Judy immediately starts riding you. You feel the pressure released immediately as your nipples squirt. Violet gasps and quickly copies her sister's movements. Once they are getting a full stream up the butt, you feel two sets of balls on your shoulders and two leaky cocks land on your chin. You stroke them and lick them in turn. You can't see their faces above their jutting breasts and/or belly. They both quickly aim their dicks after several minutes of your ministrations. You are annoyed for a moment until you see them each aim at a cheek of Violet's butt. You then just hope they don't get any on your tit. You coax their balls as they prepare to fire. Their first loads hit her squarely on each cheek and she stops riding you and looks in surprise. She has nowhere to go with your nipple up her ass. She just smiles meekly and juts her butt out to give them a bigger target.
"I guess I am gonna be huge, huh?" she asks.
"Not that huge yet," Candice tells her while pointing to the ass spread out several feet to both sides under you, "but huge, yes."
"I can feel it already growing bigger," Violet says as she rubs the cum all over her ass after the girls stop squirting. "This suit is definately too small now with this and my belly filling out."
"No fair, where's my big butt?" Judy complains.
"Coming soon," Monica promises. The shemales walk to Violet's front. "Could you help us?" she asks as she taps her dick on Violet's breasts which bulge out of her suit.
"Fuck...my ass is still growing," she says but grabs a cock in each hand and resumes riding you. "It's fun feeling my butt hit your boob after less distance each time."
"I see that," you reply. "Looks like those stitches are giving out."
"There's not going to be much left of it, I agree," Monica adds. She and Candice are rubbing their cocks on Violet's exposed titflesh.
"Hmm, I think my big butt ate your nipple, hehe. You girls want to unload on my tits?" Violet is still absently bouncing on your breast, but is now also concentrating on massaging the balls near her.
"We sure can!" Monica exclaims. "You give a really great sac massage!"
They both assist in masturbating themselves. You just enjoy the show as you feel two bellies landing more and more heavily on your tits. You sigh and watch the two butts bouncing on your own bouncy tits. Violet isn't lifting off anymore, but is still causing the same effect as her sister albeit without the slapping sounds.
"Fuck I feel like a sardine in this thing!" You see the material biting into Violet's waistline and shoulders, and even her tits as her growing butt and belly claim more material. You see a large portion of titflesh extruded from the sides of her suit.
"Look what we did, Monica. She's getting very uncomfortable."
"Yeah, that's hot." Monica grabs a handful of displaced titflesh. "I think she's going to have very saggy tits. They are just too soft to hold their shape."
"Saggy tits? I don't want saggy tits! His aren't saggy!"
"I don't see you stopping us," Candice notes.
"Oh, just fucking shoot cum on me already," Violet says indignantly. She thrusts her chest out and looks over her shoulder at you. She has an apologetic expression on her face as the first ropes of cum hit her breasts. Soon after, she tenses up. You notice first her ass clamp down on your nipple hard. Then you watch her whole body flex. Without any help, the suit tears down her back, from her shoulders down to her ass. She makes a high pitched sound as it does, and then she relaxes. After a moment she tenses up again. "I think some of your tit just went up my butt when I relaxed my butt muscles," she breathes. This is probably thanks to the firmness of your breasts.
"That's OK, I've been there. I don't mind, you can take my entire boob up your ass if you want," you reassure her.
She nods, and relaxes again. You can feel more of your breast first squashed between her cheeks and then passing through her hole. She soon switches from a squat into a split to wrap her legs around your breast. The bigger her cheeks get, the more titflesh they are able to compress. She is still not used to this, and tenses up each time she takes a little more. You don't mind, since it stimulates your milk glands.
"I wish I had something to squirt up your ass too, you hot bitch," Judy tells her sister.
"We have been working hard, but I think we can arrange that," Candice declares and nods to Monica. "You just enjoy yourself and let us handle everything."
Monica and Candice both work their dicks between Judy's legs and under her belly.
"Yeah, make me different. This fat belly isn't enough since my mom has been knocked up constantly my whole life. What do I need to do to get you off?" Judy questions.
"Oh, it's tight in there, I think we have what you want already," Monica tells her with a slightly higher pitch at the end.
"Oh. Feels tingly. Hmm, there's less room down there than I remember. What is happening exactly?"
"You wanted something to squirt, so you are going to squirt pussy juice. The rest is just making your pussy lips bigger."
"I can feel that now."
"Me too," you chime in. They must be getting pretty big if you can feel them.
"Damn I want to try it out. I've been holding this in for a while." Judy quickens her pace as you watch and starts breathing unevenly. The next thing you notice is liquid jetting from Judy's pussy onto your tit. A lot of it comes over and over.
"You can probably shoot it several feet," Candice estimates. "You will need to be in a position to do so, of course."
By the time she finishes, you have a large puddle to your right side. You look to your left tit to find it almost gone as Violet works herself lower and lower. The two shemales move to sit on the couch, exhausted.
When you see Violet's ass stop growing, she also has taken your entire breast into her. She looks over her shoulder with a sexy and triumphant look on her face. She licks her lips while she explores her new butt.
"How do you like the spread? I wasn't really wanting it to get this big, but now that it is, it's kinda hot."
"It's nice and wide," you compliment.
"These titties are another matter. They were so round and bouncy. Now they are all long and saggy and...pendulous!" Violet grabs a still-growing breast and pulls it around so you can see. They look torpedo shaped, with a long fat nipple on the end and an aereola that takes up the entire circumference. They still look as big around as before...just longer. You both watch it grow until it finally stops when settled in your cleavage right under your chin. The nipple rests on your lips.
"Damn, these pussy lips are getting huge," Judy interrupts.
"Wow, those are big! Wait, I don't see them growing," Violet says after leaning closer.
"Whew, yeah they just stopped. If they went past my knees, that would be embarrassing!"
"Not like you can see them very much with this big gut," Violet says as she pats her sister's middle. "Besides, it's not like you have a big fat rod sticking out of your crotch!"
"But I like your big fat rod," you and Judy say almost simultaneously.
"But won't those big titties be more trouble?" you ask. Violet blushes.
"I just need a large enough bra cup and it will be fine," she says with uncertainty.
"I can't wait to get them up my butt," Judy comments.
"It does feel good to both have your tits up someone's butt and have someone's tits up your butt," you tell them. "I remember the first time I took Kako's tits into my ass...my own were much smaller then."
"How was it?" Judy begins rubbing her butt.
"Heavy, especially when I got the pair in."
"I bet yours are way heavier," Violet comments.
"They are probably several times heavier. They are also firm and so won't weigh you down as much," you tell her.
"I am starting to see the appeal of this," Violet tells you with a smile.
"Oh my gawd!" Mrs. Barstone walks into the room.