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Introduction:

Amber is forced to go on a cum only diet.
Amber and Kate were chilling in the pool in their backyard. They were foster sisters getting to know each other.

Amber: Kate, why do you wear shorts to the swimming pool? You know you can wear a bikini.

Kate: I just don’t want anyone to see too much, you know?

Amber: Well, I guess. What, afraid the boys will go wild?

Kate: Actually, the girls. I’m packing.

Amber: Wait, what do you mean?

Kate: Well, this is what I mean.

Kate stands up and lets her swim shorts stick to her body, revealing the outline of her giant futa dick.

Amber: Oh my god, are you for real?

Kate: Yeah.

Amber: Does anyone else know?

Kate: My parents, and a few others, but no one else here.

Amber: My god, it’s huge! How big is it?

Kate: 9 inches flaccid.

Amber swallows.

Amber: Erect?

Kate: Varies. Max it’s ever gotten was 26 inches. But it dances between 18 and 24 inches a lot.

Amber: Wow! It sounds like a blessing and a curse. Does it cause you any discomfort?

Kate: It demands a lot of attention. Which, you know, feels good, but then I have trouble hiding all my cum, which is a lot, so...

Amber (salivating): So like, how much cum?

Kate: Bucketful's, just an ungodly amount. Enough to fill several mugs, easy. And not a small one either, like the ones you see at a German bar.

Amber: Wow, how do you even have that much cum in you?

Kate: Right, well, on top of being a futa, I also have overactive testicles. These swollen, massive things, like softballs, just constantly churning out more butter, you know. Kind of annoying really. You’ll just be sitting and the urge to jerk off overwhelms you, every day, multiple times a day. It would be ok if it wasn’t for the huge mess it leaves behind. Or having to hide my cock whenever it acts up.

Amber: You don’t have a girlfriend do you? I bet she would love that!

Kate: No, no girlfriend. I don’t think anyone but maybe like five porn stars could handle that.

Amber: Are there any porn stars that you have a crush on?

Kate: Amber, come on, they’re porn stars, they’re fine as hell.

Amber: Hahahahahahaha! So wait, are you like, horny now?

Kate (getting a little hard): I don’t know, like a little?

Amber: Well, I could maybe help you out. You need a place for your cum don’t you? My stomach is empty...

Kate’s erection is inching past her shorts down her leg. Amber salivates, her jaw unhinges.

Kate: I think maybe we should go inside?

Amber: Ok.

Kate walks behind Amber, checking out her ass in that tiny bikini. They go inside to their room.

Kate: Are you sure about this? Like, it can be a lot to handle.

Amber: It’s ok, I want to help you.

Kate: So were you thinking like a handjob or...

Amber: How about this?

Amber leans in for a kiss while pressing her full body against Kates. Feeling Kates erection go past her knee, touching her calf muscle. Her pussy gushes in wetness. They really wanted to fuck.

Amber: Is a blowjob ok? I don’t have any condoms.

Kate: They wouldn’t fit anyways. Yeah, a blowjob would be nice.

Amber gets on her knees and pulls down Kates shorts. They were pointless anyways, it was hiding nothing. She grabs her dick with both hands, feeling the veins and the sheer weight of her member. Rubbing it back and forth slowly, then brings it up to her mouth. She scoots back a little so she could get to the head of the penis. Takes the head in her mouth and starts sucking. Kate wasn’t joking, this monster was barely manageable, getting the head in her mouth felt like eating a whole cheeseburger at once. Amber didn’t know how she was getting it down her throat, but she knew she would try.

Kate: Oh my god that feels so good, I’m gonna cum, Amber, please swallow it.

Amber holds the head of the cock on her tongue and creates a vacuum around the opening. Kate was masturbating her cock to completion. Then, like a garden hose, hot sticky cum floods her mouth, swelling her cheeks. Amber swallows, only to be met with an instant refill. She couldn’t let any spill, there would be nothing to catch it. Kate wasn’t holding back. She was offered her stomach, and she was gonna make sure she used up her whole stomach. Kate, grabbing Ambers hair, bucks her hips forward. Sending her cock down Ambers throat. They both moan as fluid continues to pour down Ambers throat. Kates convulsions can be felt from Ambers tongue, all the way down her throat, right before her stomach gets shot and catches fire. Again and again, her stomach is blasted with cum like a machine gun, punching the insides of her walls, over and over, filling her quickly and making her feel hot and heavy. Amber feels her stomach with her hand, her eyes roll over as she feels it inflate and protrude. She pulls the cock out of her throat into her mouth and catches more cum. She let her tongue feel the stream of semen as it passed through her mouth, swimming, being completely submerged. Amber relished the flavor, it tasted so good to her. Her throat undulates continuously as she was chugging down the biggest meal of her lifetime faster than she had ever eaten before. Amber reaches to massage Kates balls, and feels them pulse along with her orgasm. Kate grabs Ambers head again and drives her cock down Ambers throat, not stopping for anything. Amber, shocked, tries to pull away, but Kate was persistent and kept forcing her cock further down. Amber would cough if she had airflow. She quit resisting and let the cock have its way. Then she gives in, grabs Kates ass, and pulls herself to the hilt. Kates cock now fully erect and still cumming reaches inside Ambers stomach, pushes the back wall further inside her. Kates cock, straining to go deeper, keeps pushing until the entrance to the small intestine opens up and a full 8 inches disappears into her small intestine.

Kate: Oh fuck I’m gonna cum again!

Back to back orgasms. They were in ecstasy. Kates cock erupted with even more power than the first time. Ambers whole body is hot. She is sweating from the intense heat that fills her gut. Semen pours relentlessly down her small intestine as Kates cock enjoys the euphoria of her whole cock finally being taken, triggering a monumental orgasm. Ambers stomach continues to swell as her body changes shape to push past its normal holding capacity. Amber tightens her grip on Kates ass, refusing to come up for air until all of the cum is deposited in her body. They both watch in amazement how Ambers belly swells to a ridiculous size.

Kate: Mmmm, this orgasm is much harder than the first. That was just a little one, this one is much harder. I hope you don’t mind, I’m going to be here a while.

Amber: Mmmmmm.......

Kates cock stiffens as a result of the humming, reaching its maximum 26 inches; its girth swelling Ambers already blocked passages.

Kate fucks her throat slowly and deeply, until Amber brings it back up to her mouth to taste it again, catching her breath.

Kate: This is the best, I can’t believe you’re taking it all. Every time I cum it makes a huge mess. Even when I use my bucket it just splashes out.

Amber loved that, being Kates new bucket.

Amber:Mmmmm hhhmmm hhhmmm

Amber reaches up to grab Kates titties. They look into each others eyes, Kate strokes her hair. Every second Amber would jolt to Kates orgasm.

The loss of oxygen heightens Ambers pleasure. The room is spinning and her sight is going dark. She thought she would die to her stomach ripping open. Her instinct to swallow kept her alive. Instead of fighting, her eagerness to contain Kates spillage relaxed her muscles, allowing cum to travel quickly down her digestive tract. She could feel a sharp pain jump from place to place along her gut as cum descended down her small intestine. Tens of trillions of sperm occupied Ambers digestive tract.

Amber: Mmmmm...

She wipes the sweat from her eyes and starts masturbating under her bikini. Kate is actively fucking Ambers small intestine, the tightness helps milk out a few extra splashes. Amber feels the urge to poop. Cum has traveled all the way to the large intestine. Her ass begins heating up, she can feel the pressure building but she holds it in. The thought of her insides being packed dense with semen helped her hold on as Kate's orgasm subsided into trembles. Every few seconds, another splash of semen entered her. The swelling was going down and Kate removed her cock.

Amber: That was...

Amber tried not to vomit. It came up in her cheeks, but she spilled none of it. The stomach acid has long been dissolved. She savored the taste before slowly drinking it back down.

Amber: That was amazing. My belly is so full, just look at it!.

Kate: I know. I told you I came a lot, but this is a first for me.

Kate and Amber rub the protruding belly, like she was pregnant.

Amber: People are gonna think I'm pregnant.

Kate: Nah, they'll just think you're fat.

Amber: Hey!

PT2

Amber and Kate wake up together, Kates morning wood stands straight in the air, literally pitching a tent.

Amber: Ha, looks like that thing is up before you are!

Kate: What? Oh, yeah "cock a doodle do!"

Amber: It's so swollen it looks like it hurts!

Kate: Yeah, all night I was dreaming about you swallowing my cum. It went on for hours, I'm surprised I didn't cum.

Amber: Well, you did.

Kate: What? But where did... Oh...

Amber: Thanks for breakfast!

Kate: Wow, you truly are amazing, that dream was unreal. Do you think you're up for it again?

Amber: I am down mentally, but physically...

Amber flips open the blanket and reveals her fat swollen belly. Rubbing it like she's pregnant.

Amber: I wont be able to eat for days.

Kate: Well it wont go away until we do something. I can't walk outside like this.

Amber: Oh my god I would love it if you did that.

Kate: Well, maybe the backyard... But no, like, I neeeed to take care of this, now.

Amber: Well I'm packed, but I don't think you've had breakfast yet. What do you say?

Kate: What? I've never thought of that. That is crazy!

Amber: How have you never done that? It can literally go right next to your head.

Kate: Usually I see it as a burden, so I try to do it quickly and get it over with.

Amber: Aww, that's so sad! I promise to make this more pleasurable for you, but now, I want to see you suck your own dick.

Kate: I mean... really?! That's so weird.

Amber: I think it would be hott.

Kate: We'll I guess I could try.

Kate grabs her dick and guides it into her mouth. Her jaw extends all the way and it begins to reach her throat. She backs out, wraps her tongue around it and sucks. Amber begins fingering herself.

Amber: See? Not so bad, right?

Kate: Not bad now, but I'm scared when I cum.

Amber: Just take big long gulps as fast as you can, I think you can do it!

Kate: Yeah, but what if some of it spills? It makes a huge mess.

Amber: Hey, I managed to take two of your massive loads without spilling a drop, I think you can too! Here, just taste yourself, how can you say that's not delicious?

Amber moves Kates cock back to her mouth, now oozing precum. Kate catches it on her tongue. Then wraps her lips around the head. Amber squeezes her urethra from base to tip while Kate swallows.

Kate: Wow, it's really not bad.

Amber: I know! I loved it.

Kate: Maybe I can...

Kate engulfed the head of her penis and stroked her shaft with her hands. Amber strokes near the base and fondles her balls. Kate takes more of her penis in, getting it further down her throat. Her veins start to protrude. Her cock hardens and grows. Kate has her hips off the mattress and is thrusting into her own mouth.

Amber: That looks amazing. I can't wait to see you cum!

Kate: Mmmm. Hmmmm! Mmmmmm.

Amber feels Kates cock contract and the vibration from all the semen passing through her urethra.

Amber: Wow, it's like holding a pipe with water gushing through it.

Kate: Hmmmph!

Kate's eyes are watering up, a little bit of cum shoots out of her nose, her throat undulates profusely.

Amber: Aww, your cheeks are all puffed out, you look so cute!

Kate squeezes and rubs her cock. Amber helps.

Amber: Oh, you like that?

Kate slowly starts bobbing her head, going deeper every repetition while holding her head down each time.

Amber: Wow, I can see it move through your throat!

Kate struggles to go deeper.

Amber: Here, let me help you.

Amber takes the back of Kates head and pushes down. Kate squeals and flails her arms.

Amber: Come on, keep sucking, keep sucking!

Kate's dick grew more euphoric the further she went down; increasing the intensity of her orgasm. At this point Kates stomach is full and ever expanding. The pressure Amber applied to her stomach made Kate want to throw up, but her cock was in the way. Kate was worried cum might leak out and she was flailing to help Amber keep her pinned down.

Amber: Swallow it, swallow it... Oh my god your belly. You're really doing it!

Kates cum had nowhere else to go but further down, straight into her guts. Still she swallowed. Amber puts more of her body weight on Kates head, finally reaching the hilt. Kates orgasm slowed due to the increase in volume. The feeling of having her entire cock taken in a warm embrace is too much. Kate is now fucking her own small intestine while continuing to cum.

Amber: Oh my god, yeah swallow everything.

Kates whole body twitches because of her orgasm. She holds herself with her nose buried in her balls. It doesn't matter, she isn't breathing anyway. There she sat, bending to the will of her cock. Drowning herself in cum. Amber could see she is slowing her pace.

Amber: Remember not to spill a single drop!

Amber places her hand on Kate's urethra and squeezes up while Kate slowly removes her cock and swallows the last mouthful.

Amber: Wow, look at your belly, how is that even possible?

Kate: I must have a prostate the size of a basket ball or something. This shouldn't even be possible.

Amber: Maybe it's just really dense down there.

Amber picks up one of her testicles and weighs it with her hand. They were, quite heavy.

Amber: I can't wait to fuck that thing. I'm going on birth control, so it'll be a month before it takes effect.

Kate: A month? I can't wait that long.

Amber: We have to, unless you want to have a baby.

PT3

Three weeks later.

Kate emerges from the bathroom holding her panties. Dick swinging from under her skirt. Cum smacking the walls as her cock sways back and forth towards her sister.

Kate: Amber, I can't wait any longer. I know we thought it would be hot to hold off until our big day, but look, it's overflowing.

Kate holds her cock up with one hand, her cock is drizzling semen.

Amber finds herself kneeling in front of Kate collecting semen with her hands. She swallows it then lets it pool in her hands.

Amber: Oh my god you poor thing! All day long? How was that like? In detail.

Ambers hands are overflowing again. She swallows what's in her hands and catches semen with her mouth.

Kate: Ha! Unbearable! All through class I kept having to shift to hide my giant dick. My panties got torn in second period and precum has been leaking out under my skirt since gym!

Amber: You weren't the only one leaking all over school. Everyone saw. Everyone was talking about it. You had that look on your face. Don't worry, they were as horny as you. I was wet, the girls were wet, the boys were hard. One of the girls gave me a condom. We have to fuck. The world wants us to fuck.

Kate: You have a condom? God I hope that's enough!

Amber: These things are stretchy, right? We could at least try.

They both knew it would snap. But it got them to cross the line. Amber takes out the condom and slides it three quarters of the way up, or twelve out of sixteen inches.

Kate: Well, maybe if I don't get too excited.

She undoes a button on Amber's shirt, then her cock swells, straining the condom. Amber leans in for a kiss and helps with the buttons. Amber gets on the bed and claws at Kates hips with her heels. Kate didn't miss the signal. She leans over Amber and guides her cock in and sinks six inches, tearing Amber's hymen.

Amber: Oh my god... That.... Feels......Amazing...

Kate knows she could be a challenge for most women and knows she has to go slow. But Amber is done waiting. She hooks her legs around Kate and pulls her in. Kate totally loses balance and falls on top of Amber. Plunging in deeply.

Amber rubs her fingers through Kates hair and french kisses her. Her legs squeezing Kate every other second, pulling Kate further and further in. She managed to get 9 inches in and is working hard to go deeper.

Kate picks up the pace, knowing how she likes it. It didn't take long, Amber started cumming. Her legs wrapped around Kates back, clenching all over her dick. Kate is fighting the urge to cum, she wants to bury her cock deeper first. And then, the base of her dick felt really good. Her attention quickly shifted and realized she had gone in past the condom. Her cock swells. She fights to keep the sensation, forcing her cock to penetrate Amber deeper.

Amber: Ohhh, it got bigger...

Kate: I can feel you. For real. I'm deeper than the condom.

Amber: Oh my god you're so close to getting it all in! Let me help get it deeper.

Amber stretches as Kate jams her cock in and pushes against her back wall, momentarily gaining another inch. Blood is having trouble elongating the dick so instead it gets thicker. Kate is pounding Amber, her balls are slapping her sisters ass. Kate loves the feeling of the few inches of real pussy at the base of her cock. Driving her to go deeper. She holds it deep.

Amber: Mmm, yes... Right there.

Kate presses her cock down, harder this time. Making Ambers stomach bulge out and forces her way deeper, finally getting the last bit of the base of her cock. Twenty inches disappears inside. Her stomach makes a huge bulge.

Kate: Ohhhhh, oh my god. That is so good. That is so hot. I can feel your pussy at the base of my dick.

Kate fucks her at this depth, but keeping the base of her cock wet becomes more and more challenging. Kate thrusts again but feels the condom tear, her entire cock becomes enveloped by Ambers hot pussy all at once. The sensation is irresistible. Kate holds herself deep and makes out with Amber, messing up her hair in the process. Amber locks her legs around Kate and refuses to let go, even as Kate's cock continues to grow.

Amber: Oh my god. You're so deep! Ugh!

Kate: It feels so good! I don't think that condom lasted very long.

Kate drags out the broken condom and flings it against the wall then buries her cock unprotected.

Kate: Mmmm, Amber, I'm about to cum!

Amber: Oh god, no condom? I could get pregnant!

Kate: I can pull out, but my precum may have already sealed the deal.

Amber: No! I can't get pregnant! Just a little longer, it feels so good!

Kate: If I hold off any further my dick is gonna get too big!

Amber: Just a little longer, Kate, I'm so close!

Kate's cock strains against Amber's cervix, she holds it at the entrance as her cock busts through her tiny hole and finds herself submerged in Ambers uterus. Inches from her fertile egg.

Amber: Ayee! Kate! Your cock is in my womb! Ouch! Take it out! It hurts!

Kate plops out of Amber's cervix, but continues to softly fuck her.

Kate: Are you ok? I'm very close, but I don't want to hurt you.

Amber: I want you to feel good too, maybe you can just go slow? I still want you to have your entire cock inside me.

Kate slowly sends her cock through Amber's cervix again, stretching the back wall of her womb. She slowly pulls it back out through Amber's cervix then back in. They watch the rise and fall of Amber's stomach as it bulges in front of them.

Amber: You can go a little faster, it's starting to feel good. I kinda like it.

Kate: Oh my god it's getting bigger! Amber! I think it's at full mast! My whole cock! All twenty six inches! Oh Amber, I think I love you!

Amber: Kate, I love you too! This feels amazing!

They french kiss once again. Amber rubs the bulge in front of her chest. Feeling the cock inside her deepest parts. Her head spins, she can barely see straight.

Amber: I'm cumming! Oh god! Kate, I'm cumming!

Kate: I'm gonna cum too! Amber, I can't pull out! Your cervix is too-

Amber interrupts her with a kiss. She locks her arms and legs around her and holds her deep as Kate fires hard directly inside her womb. Three weeks of pent up jizz is finally released as Amber is inflated with trillions of sperm. Virile, healthy, racing sperm. All with the same goal, to find Amber's egg. Kate is unable to quit throbbing and Amber won't let her go, forcing her womb to endure the onslaught. They feel Amber's womb from the outside growing as jizz gets pumped inside relentlessly. They continue to make out as their pubic bones mash against one another. The flood gates have been opened, they were set to embrace the full payload. Kate's pent up balls were given the signal and there's no backing out. Her cock shoots out hot jizz at a blistering speed, giving into pleasure and forgetting about the consequences. Cum spills out as Kate thrusts her hips. The bed becomes a mess, but they didn't mind. Amber is brought through a string of orgasms to compete with Kate's endless throbbing. Gallon after gallon of hot cum lands inside Amber's bloated womb, they don't own a bucket large enough to contain it all, Amber's womb is all there is.

Amber: God, that's so much! Are you done?

Kate's cock continues to throb, slowly. They kiss once again.

Kate: Just about.

Amber: We should get some plan b.

Kate: Girl, your egg is soaked in my sperm. You're probably already pregnant.

Amber: Do you think the damage is done?

Kate: Definitely.

Amber: So you won't mind if we go again, do you?
1 comments

Tiger_tReport 

2021-12-10 15:28:44
Freaking awesome story, keep them cumming.

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