Kayla boarded the train to see her boyfriend. Sometimes it was hard to maintain a relationship at opposite ends of a state, but that just made their reunions that much sweeter. This visit was a surprise; Kayla had been planning for months, making sure Charlie hadn’t made any plans for the weekend. So she tumbled into a seat, exhausted- the sun wasn’t even up yet, but Kayla wanted to get breakfast with her beau, so she had to leave early. Too early, she thought.

She pulled her ticket out of her bag and placed it in one of the holders on the seat in front of her. Kayla checked her phone for the time. Two hours until my stop, she thought, plenty of time to take a nap. “I wish... I hope this is the best surprise ever...” she whispered as she drifted off to sleep.

Kayla awoke because she couldn’t find a comfortable position. Checking her phone again, it had only been about half an hour since she boarded. She wondered why she couldn’t get comfortable, and twisted around in her seat. Kayla suddenly realized where the discomfort was coming from- it wasn’t the seat, it was her bra. She felt like her boobs were slipping out of the cups, and so tried to settle them back in by pulling the cups out and up. That didn’t solve the problem, though, now it just felt like her boobs were being squeezed out of the cups, above and below them.

What the heck? This bra fits. I know it does. She stood up and walked to the bathroom. It was too small, cramped, but it would do. Kayla lifted her sweatshirt up over her head, then her t-shirt, then faced the mirror. “What the heck,” she said, trying to stay quiet enough that the other passengers wouldn’t hear her. Kayla was used to her orange-sized breasts fitting comfortably inside her C cup bra.

She was currently looking at a pair that mushroomed above and below the cups of her bra. As she stared at them incredulously, Kayla would swear she could see them edging slightly bigger with every second passed. Kayla quickly worked to unhook her bra, curious to see that it was really her breasts that were overflowing the bra that fit them this morning. She released her breasts from their confines, and they bounded out into the open space, and Kayla saw that it really was her breasts overflowing the bra, not her imagination or a trick of the light. Okay, Kayla, stay calm, your boobs have just grown about three cup sizes in half an hour while you were sleeping... maybe I’m still sleeping? Is this a dream? She pinched herself on the arm. NOPE, great, I guess this is really happening... why are my boobs growing? What the heck what the heck what the heck...

A sudden knock rang out on the bathroom door that startled her. She jumped in surprise, her bigger breasts bobbling around until they settled. “Just a minute!” she called out. Kayla hurriedly put her t-shirt and hoodie back on. No point in trying to squeeze back into my bra now... She stuffed her useless bra into the pocket on her sweatshirt. Before leaving, she flushed the toilet and washed her hands to eliminate suspicion.

Back in her seat, Kayla tried her best to remain calm. Maybe the whole “pinch yourself if you think you’re dreaming” thing doesn’t actually work... I’m going... toooooooo... hmmm. I’m going to... go back to napping. Hopefully I’ll wake up for real with my normal boobs. Right? She fell into fitful sleep, unable to adjust to the increased weight of her chest.

After another half hour of tossing and turning, Kayla woke again. She sat up straight and immediately felt her breasts move around. Oh, shit. This is really happening. Are they... Kayla surreptitiously felt her breasts. Oh my god. They’re bigger again. She pulled her arms into her hoodie to more easily disguise how she was fondling herself. Feeling her breasts, Kayla was amazed. My boobs are huge! I’ve got melons in my hoodie! I hope Charlie likes ‘em big ‘cause these are gonna look ridiculous on me...

She took a deep breath and slowly exhaled. Okay, Kayla, your boobs are getting bigger right now. There’s nothing you can do about it right now, so just relax, because in an hour you’ll be at Charlie’s house and you can both see how bad having huge boobs will be. Kayla put on her headphones to listen to music and looked out the window, trying to forget about her ever-increasing bustiness. Ignoring the growth became harder and harder as it continued, because every time the train bounced or turned, her breasts jostled around inside her shirt. As they got bigger, her nipples rubbed against the shirt more and more. She didn’t want to admit it, but the friction between her stiff nipples and her shirt was really starting to turn her on.

Not wanting to deal with her body and the train conspiring against her, Kayla walked back to the bathroom and pulled her shirts off. Before putting just her hoodie back on, she stared dumbfounded by the size of the breasts that now sat atop her chest. These things are like the size of my head... can we chill out with the growth yet? Please? She sighed, resignedly putting her sweatshirt back on. Kayla hid her t shirt in the pocket like she did with her bra the last time she left the bathroom.

Back in her seat, Kayla stuffed her shirt into her bag and checked her phone again. There were only twenty minutes until the train should arrive at her station. Hopefully these boobs will still fit in my hoodie at that point. She reclined in her seat, now more accepting of her continuing growth than before. Kayla felt them press more and more against the fabric of her sweatshirt as they grew and took up more space on her torso, soon passing her navel. She pulled her arms into her hoodie and palmed her tits, feeling them push against her hands as they swelled. Looking down at herself, it was clear she couldn’t hide her growth anymore. Her hoodie sloped down following the curve of her breasts, with noticeable tents for her nipples.

The automated voice on the train announced she had reached her stop. Kayla stood and grabbed her bag, stuffing her shirt and bra further down so they weren’t noticeable. She jiggled her way off the train, trying to ignore the stares of everyone she passed by. Nothing to see here folks, just a girl with huge tits coming through. Her nipples hardened in the cold air outside the train, even through her hoodie. The nubs poked into the material of the shirt, creating peaks obvious to any passerby. Kayla tried to walk quickly, but that just made her huge breasts bounce even more conspicuously. She returned to her normal speed and hoped no one would notice the indentations from her nipples, which had grown along with her breasts. She didn’t want to admit it, but her teats had stayed proportionate to her burgeoning boobs.

After a few minutes of walking, she stood in front of Charlie’s door, the bottoms of her huge breasts now actually hanging out of her hoodie. She knocked, urgently, wanting to get inside--away from leering pedestrians and into the warmth--as soon as possible.  Her boyfriend opened the door, rubbing the sleep from his eyes.

“Kayla? What’re yo-” she interrupted him by pushing past him into his apartment. Her boobs fell out of her hoodie, her nipples fully on display. Kayla turned to face him and pulled her sweatshirt off.

“I came down to surprise you and while I was on the train I grew these,” she gestured to her huge breasts. Charlie observed them; they were amazing, otherworldly. The bottoms of her tits reached down to her hips; their outer edges wider than them. Kayla’s big nipples, now resembling thimbles, rested nearly a foot in front of her. He couldn’t wait to get his hands on them. “And now that I’m here, we’re going to get breakfast at that diner down the street, but first, you’re going to get back in bed with me, and you’re going to explore every inch of these tits.”