“Do you really have to leave?” she asked, still lying in bed, enormous breasts piled on top of her. She pouted at her boyfriend.

“You know I have to be at work early tomorrow, princess,” he kissed her forehead as he got dressed. “Otherwise I’d never leave.” He had been dumbfounded at first, with his girlfriend shoving two immense boobs in his face. Something about their relationship and the distance between them made them… grow. The closer they were, the bigger they got. Her breasts and his cock.

It was a challenge, fitting all of himself in his pants as he pulled them on. The monster between his legs was superhuman, at least eleven inches long when erect, and thick. Charlie was unsure how Kayla got any of it inside her. It had all started a few weeks ago; Kayla took the train down to surprise him and ended up surprising both of them with a very large, very sensitive, pair of tits.

This weekend had been an experiment.

It was Charlie’s turn to visit Kayla, so he hopped a train after work on Friday. He worked earlier hours than Kayla, but she was confident she would be out before she started growing- if she did. Charlie blithely listened to music as he stared out the window. He noticed a weird feeling in his jeans, like the beginning of an erection that wouldn’t go away. Just thinking about Kayla and what she’s gonna look like later too much, I guess, he thought. Minute after minute, though, the feeling was still there. If anything, it was more noticeable. Charlie stood, walking to the bathroom, intent on investigating what was going on.

He unbuttoned his jeans and pulled down his boxers, letting his penis flop out. Is it… bigger? Charlie worked himself to a full erection, and concluded yes- he was bigger. His normal five inches was looking like six now. Oh boy, he thought, I guess it’s my turn now. Charlie pulled up his phone and texted Kayla if he could snap her something for her eyes only, hoping she got the implication. She responded in the affirmative, she was home now, waiting for him. He sent her a picture of his bigger dick. She responded in kind, returning a picture of herself—topless—with her boobs getting bigger by the minute.

Kayla was resting on the couch in her tiny studio apartment. She took her shirt off immediately after getting home; Charlie’s voyage towards her was making her grow again. Luckily, she had escaped the office before her boobs were too obviously growing too big for her bra. Kayla had to push down on her bra to get her boobs out of it, the swollen jugs bouncing around, bounding into the open space once she was free.

“Glad to have your girls at this size again,” she said as she observed her head-sized breasts. “Can’t wait to see you two get even bigger.” Kayla idly played with her boobs as she leaned back against her couch. They grew in her hands. Kayla suddenly had a thought, a naughty one, one that could make Charlie’s trip more… interesting. She opened up snapchat and began taking a video, playing with her bigger boobs and plump nipples with one hand. “Oh god,” she moaned, “this feels so good, Charlie.” Kayla gasped as she pinched a nipple, and she let out a final moan as the video finished recording. She sent it to Charlie.

Now back in his seat on the train, Charlie opened a snap from Kayla. His music paused, and he quickly turned his phone towards the wall as he was greeted by Kayla’s nipples. Charlie’s growing manhood pushed against his jeans as he heard her moan, growing to an uncomfortable length. He surreptitiously adjusted his position, trying to get himself reoriented in his pants. Leaning up against the wall, Charlie felt his phone buzz with a facetime request from Kayla.

“Dammit, Kayla, always a tease,” he whispered as he accepted. Charlie was glad his phone screen was angled away from anyone else; Kayla’s camera was focused on her boobs. “Hey good lookin’ ;),” he typed to her.

“You ass,” she responded.

“Hey, you’re the one who started the facetime on their tits, babe. I’m just admiring the view.”

“I guess you’re right, hun. How’s yours looking?”

“Haven’t checked recently. Let’s go see, shall we?” Charlie stuffed his phone in his pocket and walked back to the bathroom. Inside the cramped room, Charlie rid himself of his jeans and pulled his cock out again. “Damn,” he whispered; Kayla heard him. He heard her voice in his headphones. “What? ‘Damn’ what? Let me see!”

He angled his phone down to display his lengthening endowment; Kayla gasped as she saw the hard eight inches rising from Charlie’s pelvis. “It’s getting so big,” she said, doing nothing to hide her arousal.

“You like that, huh, babe?”

Kayla whined. “Don’t tease me like this, Charlie.”

He brought his phone back up to show his face. “No more until I get to your place,” Charlie said, smirking.

Kayla looked miffed. “You’re the worst.”

“Love you,” he replied.

“Yeah, whatever. Jerk,” Kayla responded, jokingly. “I’ll see you when you get here, stud.”

Charlie closed the facetime and returned to his seat. He was determined not to steal any glances at himself either; he wanted to surprise both of them. Although at least Charlie could feel how big he was getting, as the end of his cock slithered farther down the leg of his pants. He stared out the window as the sun set, trying not to think about his growing penis.

Kayla laid on her couch under the growing weight of her boobs, relaxing as she felt more and more of her chest get covered by perky, sensitive tit. She idly played with one of them. “I didn’t notice this the first time, but growing feels really good. Like a part of me wouldn’t mind if they just kept going forever.”

You still have to work a job, Kayla, her brain reminded her. “Ugh,” she complained. “Damn capitalism. Couldn’t I just be a model known for having the biggest tits in the world? I can picture the headline of my website now: ‘Watch as Big Titty Kayla grows bigger and bigger’.” She squeezed both breasts and sighed a happy little sigh from the pleasure.

“So what am I at now, head sized? That means Charlie is what, halfway here? So much size to go still.” Kayla stood up in front of her mirror, a body-length one, and struck different poses, exploring how her growing boobs moved with her. She stood straight and tried to touch her elbows together, creating a ridiculous amount of cleavage. That’s something we didn’t try last time… why not this weekend?

Kayla leaned over her counter, resting on her elbows. Her nipples perked up as they made contact with the cold surface. She moaned. Oh, that’s good, Kayla thought. She checked her phone. “Nothing from Charlie,” she complained. “I guess that butthead was serious.”

She started taking selfies; things to tease Charlie with when they were separated, she figured. At least it’s something to kill time until I can see that monster cock of his…

They were passing by Kayla’s navel by now, a sign that Charlie was almost there. “My nips are getting pretty big, too, geez,” she said as she stared down at them. She firmly grabbed the thimble-sized nubs and almost buckled over with the feeling. Save it for Charlie, Kayla, she mentally scolded herself. Frustrated, Kayla got back on the couch and turned her TV on- she was out of ideas for time-wasters. Her eyelids felt heavy as she rested her head on a pillow. It had been a long day at work…

She woke with the sound of someone knocking on her door. Looking down at her breasts, Kayla knew it was Charlie. Her torso was covered in boob, nearly a foot of it lay on top of her. She heaved herself up and sashayed her way to the door, standing to the side as she opened it so no one in the hallway would see her super-endowed self.

“Hey handsome,” Kayla said as she embraced her beau. Her boobs squished out between them.

“Hey beautiful,” he replied.

Kayla released him. “So I had an idea what we could start off with today…” she smiled devilishly.

“You’re not wasting any time today.” Charlie laughed as he said it.

“Well somebody left me alone with my overactive imagination tonight. What did you expect? Now get your butt in my bed, already.”

He obliged the huge-breasted goddess he called his girlfriend. She laid on her back on the mattress. “Get on top of me,” she said. “If you don’t want to fuck these tits, we need to have a serious discussion.”

“No discussion needed here.” Charlie was already pulling his jeans off. Kayla helped with his shirt. As he shimmied out of his boxers, Kayla gasped at the penis she saw. “Jesus,” she whispered.

“Was it worth the wait?”

“Wouldn’t you like to know? Get it between my tits already.” Kayla grabbed a bottle of lotion and squeezed out a quantity huge enough to cover the valley between her boobs. She slathered it around.
Charlie pushed his huge cock in between her soft mountains of flesh, both lovers shuddering with the sensation. He picked up speed as he moved back and forth. Kayla pressed her hands into her breasts, smothering Charlie’s dick in her copious amounts of breast. She couldn’t help but play with her nipples at the same time. She writhed beneath her boyfriend, relishing the feeling of his nearly foot-long cock penetrate her cleavage.

She felt him stiffen even further, and knew what was coming. A few seconds later, his manhood blasted her face with cum, the white liquid spurting out in long ropes. By the time he finished, Kayla’s face, neck, and cleavage were covered in ejaculate. She smiled up at him. “You’d better be ready to go again, stud, because I need that thing inside me.”

Sunday at noon, Kayla finally woke up, exhausted from two long nights of super-fleshy loving. Charlie was already up and packing. He walked back into her bedroom. “Unfortunately,” he said, “it’s almost time for me to leave, sleepyhead.”

“Do you really have to leave?” she asked, still lying in bed, enormous breasts piled on top of her. She pouted at her boyfriend.

“You know I have to be at work early tomorrow, princess,” he kissed her forehead as he got dressed. “Otherwise I’d never leave.”

She pouted as he gathered his stuff to leave. “Just one more quickie before you go?”

Charlie knew he was helpless against that face. “Of course,” he said, reversing his previous motions. He pulled a condom over his huge cock—Thank God these things stretch so much, he thought—and climbed back in bed on top of Kayla. His gentle hands fondled a breast, using his thumb to flick a nipple back and forth as he pushed into her. She moaned as he went deeper.

Charlie fulfilled the “quick” part of the deal, maybe a little too quickly for Kayla’s taste. He finished again as Kayla came as well, her curvy body jiggling as she shivered with her orgasm. He pulled out and stood.

“I have to go, for real this time, babe.”

Kayla sighed. “I knoooooow. Have a safe trip back, hun.” They kissed each other goodbye, and Kayla attempted to get back to sleep.

“I wish this was permanent…” Kayla whispered into her pillow.

-------

A few hours later, Charlie got a snap from Kayla. It was a picture, except… she was as busty as ever. “They’re not shrinking,” the snap said. He didn’t even notice his dick hadn’t gotten any smaller; he had gotten used to it. He sent a snap back of his own endowment.

“I’m not either.”