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"Sorry to hear that...."

"Oh don't be. I kind of like it actually, I'm still getting used to my breasts being so big so the whole thing makes me kind of shy."

"They haven't been this big long?"

"No, I'm part of a research study on radiation-induced gigantomastia."

"That's a mouthful, how'd you get roped up in that?"

"Well, my insurance I guess has this waiver I had to sign like in order to keep being insured I can be selected for research studies. Which I don't mind at all!"

"And that's this..... radiation thing?"

"Oh, yeah! It's pretty cool actually."

"I'm all ears."

A man stood next to Michelle, taking out his dick, jerking off standing next to her. She smiled big and blushed, giggling. "Oh God, OK, let me." Michelle took the man's cock, jerking it off for him as she resumed the conversation. "Sooo, basically I used to only have a C-Cup last year. They injected a small culture of benign and malignant cysts and tumors and put them in my boobs. Then they started using targeted radiation to accelerate their growth. I'm a biology major so it's actually super interesting to me!"

"So your breasts are full of cysts and tumors?"

"Yep! Who knows how many. Oh, do I hear groaning? Hang on." Michelle jerked off the man next to her more enthusiastically, opening her mouth wide. She directed his six consecutive loads into her mouth, looking up at him, keeping eye contact. "Any more?" The man shook his head no. "Awww, you did great," she said, swallowing his load. The man slapped his dick against her cheek, wiping it off. "Thank you," she said as he zipped back up, heading to the business car. "Anyway," she wiped his cum off her cheek with her fingers, eating the rest of his cum.

"You seem awfully busy," the first man joked.

"Yep, always am! Guys just can't help themselves. At least you're well behaved."

"For now."

Michelle bit her lip, feeling her breasts, bunching them together. "Soooo, yeah, my boobs are filled to the brim with cysts, tumors, and other growths, which are being inflated super fast with radiation. This is a popular new Korean med-spa thing to rapidly grow monster-size boobs, but these researchers are testing to see how dangerous it is."

"Judging by how massive those are, I'm going to say very. I bet there are tumors in those things the size of your head."

"Oh definitely, even bigger probably! At least they're still soft. For now!"

"And what exactly is the endgame of this?"

"Well, to inflate them as much as possible, harvest the biggest growths in my boobs, patch me up and force me to grow more."

"Wait, so your breasts are basically like farms for these tumors and cysts Korean girls are inflating their breasts with?"

"Correct! So every six months or so my boobs will be reduced to like.... a DD-Cup, then they'll be reinflated. This is actually already my second batch! Last time they got quite a bit bigger before my team took all the growths out and started over, leaving me with a DD-cup. So for the foreseeable future I'm gonna have to grow these massive breasts and get them reduced over and over. The biggest tumor last time was like the size of a watermelon! I couldn't believe how many they pulled out and that all those things were in my boobs. It's kinda hot but yeah, probably very dangerous."

"Damn, shame you can't keep them."

"Oh, I can! Once the study is over in three years I was told I can stay as big as I want or get a full double mastectomy."

"I hope you intend to keep them."

"Why, you love big radiation-inflated tits like these?" She bunched them together and he could see the outline of a growth about the size of her head push against the surface of her breast.

"And I'm guessing you're headed to the city to get those things pumped with more radiation?"

"Uh-huh, I should get biohazard tattoos on these things to warn guys.... Just kidding, it's safe for everyone, just not the girl carrying them around."

"Worth it, I'd say."

"Me, too! Since you've been such a gentleman.... I don't get off for another eight stops.... wanna take me to the restroom over there and have some fun?"

"I take it that's why you were already sweaty when I got on?"

"I like to reward guys who chat with me instead of just treating me like a toilet to shoot cum into. Not that I mind that, just look at these breasts, who can blame them?"

"I sure can't. You seem to enjoy getting guys off."

"I mean..... it IS important for the research study, immersing myself in the lifestyle of a girl obsessed with male satisfaction so badly I'd overflow my own breasts with radiation-fueled growths. My team loves to hear about my little adventures. Thankfully as a biological researcher I can do much of my work sitting down....."

"I take it that means you're definitely keeping those massive breasts?"

Michelle blushed. "I'm totally addicted to them. I love growing all these awesome oversized tumors for my team to drop their jaws at. I think it's exciting seeing that come out of me....." She pushed her breasts together, horny as hell, taking the man's hand, pushing it onto one of her breasts. "Now come on, get me nice and sweaty again before I see the team! And if I ever see you on this train again, you better not chat with me, OK? I want you to grope my tits and demand to put your cock in me."

"I won't even ask, sweetheart, I'll just rip off your clothes and have all the fun I want."

Professor Johnson looked from Burroughs to you and gave a small smirk. The look of subtle approval sent a satisfied shock through you. Immediately you felt your nipples harden and threaten to pierce your overly strained tank top. As your secret benefactor turned back towards Burroughs, you felt the pressure behind your nipples peak before beads of sweet milk began to pool in the fabric and spill down your shirt. You stifled the smallest of moans as they bickered back and forth.

"I could understand how her being in a trial two days in a row could be a clerical error, but four? She's so full of experimental drugs right now that her clothes can't even contain her!" He didn't know that you had bribed Johnson to have access to these trials. Even better, neither of them knew that starting on the second day, you began to buy the drugs from several of the other trial participants, quickly realizing that they were only there for the money not the actual effects of the drug. Those extra drugs were now safely in your purse hanging off the chair.

It was advertised as a breast enhancement lactation drug. Side effects include: increased fertility, increased libido, increased appetite, increased sensitivity, dominant tendencies, muscle growth, etc...

As Johnson tried to explain away how you happened to be in all four trials, the drugs from that day began to kick in. Waves of pleasure began to wash over you as your milk fully let down. Neither was looking at you as you felt your fourth growth spurt in as many days take hold.

A loud creak in the chair followed by a massive tearing noise in your top instantly demanded the focus of both administrators. Their jaws dropped as your breasts were finally freed, openly spraying steady streams of milk across the room.

"Oops." You muttered, standing up and taking the chair with you. Shaking your ass free caused it to break apart, your skirt falling away with it. You were now left in a spilt top and strained, soaked panties. "I think your drug works really well." You said, hefting your new udders to test their size and sensitivity. You cooed in pleasure as they jiggled endlessly in your hands before moving to your nipples to express torrents of milk. "I feel so huge. I feel so sexy. I feel so good." You moaned, temporarily lost in your own pleasure. Johnson reached across the desk to grab his milk-splattered clipboard and began to take notes. 'Subject is in a state of euphoria. Subject has grown over a foot and several cup sizes. Subject is a giant sexy milk machine.' He only thought that last part, but he wasn't wrong.

"We need to get her to a hospital!" Burroughs said, trying to take control of the situation.

"No, I think I want to see where this goes." Johnson countered. "It's valuable data. Imagine if this drug makes it to market. Anyone would be able to take a dose this high."

His words pulled you from your stupor. You weren't just anyone. You didn't want anyone to be able to have what you had. "You make several good points professor. Except. No one else should be able to take a dose this high. I will give you some more data to work with though." Reaching down into your purse, you pulled out the bag of drugs from the other participants and emptied it into your mouth before either administrator could comprehend what was happening. You grinned and stuck out your tongue after swallowing them all like you needed to prove that you actually did it.

"Holy shit," Johnson blurted out. "You actually did it."

"You boys might want to run." You teased, already feeling the pills starting to work their magic. You could feel your heartbeat in your nipples as they heated up, the flow of milk only increasing with each cup size. Your feeble panties snapped away as another wave of growth surged through you. Naked and glowing, you reveled in your own enormity as your tits started to envelop the room. The exit was behind you. The two man were now trapped as your breasts began to press into them, coating them with your milk. They pushed and fought against your massive mammeries, but that only fueled your arousal.

"That's it, knead my giant fucking tits. That feels so good! You might as well help me out while you're over there, why not latch on? Have a drink? I'm producing more than enough for everyone!" It was true. The whole floor was now soaked and the room was full of the sweet scent of your milk and arousal. Suddenly you felt it, two needy mouths tugging and sucking on your impossibly sensitive nipples. An intense orgasm immediately wracking through you. As you threw your head back, you bumped the ceiling. You were running out of room. Post climax weakness filling your legs, you fell to your knees before collapsing in the cool pool of your own milk. Your last conscious thought was that you hoped you were still getting paid for all four days of the trial since new clothes would be really expensive. And you'd need an industrial sized pump. And a bigger place to live.

Vanessa would be bringing boys around our home all the time. She had sex constantly and was not shy about people seeing her in the act. Oftentimes if we were around she'd be riding a guy, on top, she'd turn to us and smile if we walked by her room and its always-open door. "Mom, dad, take my picture! Don't I look beautiful all covered in sweat, pleasing a guy?" she'd say, and we'd oblige, photographing her. Putting it on our Instagram for everyone to see.

But sadly Vanessa's massive fake breasts simply couldn't take anymore. While surrounded by guys, at a neighbor's firepit gathering, a guy smacked her left breast as she rode another. It completely split apart. The saline inside ruptured out, splitting her implant, then the gush of saline tore right through her already stretched skin and it popped like a big water balloon all over the guy's lap. The men went crazy and started smacking her right breast and the same thing happened. It split diagonally across the whole breast. This left her with two very large, empty 'sacks' as the remains of her beloved monster fake tits.