Denise knocked on the door to the large suburban house, straightening her blouse as she waited to be let in. This was her first time babysitting for this family, even though it was right down the street from her. She wanted to make a good impression. Denise was 19 years old, slim, and quite pretty, with long straight brown hair and and easy smile. She had always been quite good at watching children, so it made sense to babysit to make a little cash on the side while on summer break from college.

The family she had talked to on the phone was strange. Few people in the neighborhood ever saw them leave the house, or knew what they did for a living. She had never seen the mother before, or the children she was about to watch - twin girls. The mother had sounded strange over the phone, almost as if she was scared to hire a babysitter for some reason. But the woman apparently had some sort of surgery today, and didn't have any other options. Denise was going to be watching the twins until late in the night.

The door opened, and the Denise's mouth dropped open, staring. The woman who greeted Denise was a little shorter than her, and looked to be in her early 30s, with golden blonde hair that fell to her shoulders. She also had by far the largest breasts Denise had ever seen. Denise had D-cup boobs which looked big on her slim frame. But this woman... Denise was surprised she could stand with the weight. These things were massive. The woman was slightly plump, but definitely wasn't fat enough to explain the size of her boobs. They jutted out from her chest like twin yoga balls, held by a frilly white bra with extremely thick straps. Denise cringed internally as she thought of how much her back must hurt. Finally she broke her eyes away from the woman's chest, hoping she wasn't staring too obviously, and put on a big "let me introduce myself" smile.

"You must be Denise," the woman said in a tired voice. She was clearly exhausted, judging from the bags under her eyes. The girls must be a handful, if she was this ragged. Or maybe just lugging her tits around all day wore her out, she thought with an internal grin. "I'm Patricia Neely," she said. "Come on in."

Patricia proceeded to show Denise around the house, explaining how things operated under her roof in a friendly manner, yet unable to keep the tiredness out of her voice. She moved around the house with surprising nimbleness, not bumping into anything with her enormous breasts as she twisted around the kitchen counters and through the hallways. Denise noticed something odd about the house: all the door frames were wider than she was used to. With a start, she realized that Patricia only barely fit through the frames without touching her breasts to the sides anyway. Mere inches of space remained when she passed through them, as well as the hallways. If the doors were the regular width, Patricia would have had to squeeze through every door.

Finally, they went upstairs to the twins' room. It was large and colorful, and the ground was littered with toys. Two beds sat on one side of the room, but the girls were on the ground playing with some dolls. The twin girls were wearing matching blue dresses. Both had their dark blonde hair done up in pigtails; one had them tied up with blue ribbons, the other had pink. Patricia introduced the one with the pink ribbons as Katie, and the one with the blue ribbons as Lizzie. Denise was surprised when Patricia said they were only 4 years old. They looked older than that. "Girls, this is Denise. She's going to watch you tonight and put you to bed. I want you to be on your BEST BEHAVIOR, understand?" Patricia said sternly, looking back and forth.

Lizzie was holding her hands clasped in front of her adorably, looking at Denise with wide innocent eyes. Katie was sucking her thumb and looking back and forth between her mother and Denise. Both girls nodded slowly. Katie then popped her thumb out of her mouth and asked "Milk?" Denise wasn't sure, but it seemed like Patricia shuddered slightly next to her. Lizzie's eyes grew wider upon hearing the word, and she looked hungrily at her mother's chest. "Yes, yes. I'll feed you before I leave. Come on girls." Patricia said in a voice that sounded a little rushed. She beckoned them and went back downstairs and out into the living room, the girls following eagerly behind. Denise was a little intrigued to see this woman feeding the girls with her monster boobs. No shortage of milk there, she thought to herself as she tagged along.

Patricia set herself up on a loveseat couch, pulling a large ottoman forward and resting her legs on it as she began unbuttoning her shirt. The ottoman was big enough to allow both twins to climb up next to their mother's legs and reach her nipples, which jutted out so far that nobody would be able to sit on her lap to suck them. As Patricia unbuttoned her shirt, Denise noticed how tight the buttons appeared to be. Boobflesh peeked out from between them. She took the shirt off, and Denise stifled a gasp. Patricia's enormous bra didn't even fit her. Her boobs jutted out over the tops of the cups as if they were several sizes too big. "Alright girls, help mommy get her bra off," she said, resting her hands on her breasts. The girls leaned forward and, with practiced motions, teamed up to undo several clasps that held the front of Patricia's bra together. Denise wondered if Patricia would even have been able to undo the bra herself. Judging from the position of her hands, it looked like they would barely be able to reach the clasps.

The twins struggled with the tight clasps for a minute, but just as Denise was about to offer a hand in assistance, they undid the last one, and Patricia's breasts bounced outward and down. From the way the cups sprang apart, Denise was pretty sure she wouldn't be able to get those tits back into the bra without a lot of help. The girls leaned forward eagerly to take the nipples in their mouths, and Patricia closed her eyes as they began to feed. Denise watched silently, trying not to awkwardly stare at the spectacle. She took out her smartphone and started checking social media, just to make it less awkward. She looked up, however, when she realized the sounds she was hearing. The twins were GUZZLING the milk from their mother's breasts, and the sound of rushing liquid made it obvious that they were drinking a LOT. Denise's eyes widened as she realized both girls had full cheeks, as if containing great pressure in their mouths. She saw both Lizzie's and Katie's throats working furiously as they swallowed mouthful after mouthful of milk.

Patricia had a small smile on her face, and slowly opened her eyes to look at Denise. The look of relief was clear in her eyes, even with the bags under them. She must have been uncomfortable, holding in the pressure of so much milk. Denise tried to take the shocked expression from her face, and averted her eyes. "So, um, how old did you say the girls were?" asked Denise, trying to seem like this situation was normal. Patricia reached forward and began patting the twins' heads affectionately. Her arms had to extend all the way, draping over the swell of her bosom to reach them. "They're a little over 4 years old, and thankfully potty-trained," she said. "But they look older. These girls grow fast because they get so much... nutrition," she said with a smirk. She looked down at her breasts. "I didn't always use to be this big, you know. I started off with E-cups."

Denise couldn't help but open her eyes wide and hold her hand to her mouth as she stifled a gasp. Patricia laughed softly. "I know. Crazy, right? The doctors said they'd never seen such fast mammary growth during my pregnancy. By the time I was ready to give birth, I had M-cups. Between these and my belly, I looked like I was smuggling a bunch of watermelons under my shirt." Denise looked down at Patricia's breasts. They were quite a bit larger than watermelons now. The twins were still hungrily chugging away. How did they drink so much at one time? It was unnatural. They sounded like they were consuming gallons of milk.

"But how..." Denise floundered over the right words. "How did I get to THIS size?" Patricia finished her question for her. "Well, once the girls were born, they just kept... growing. I kept on having to find new bras, and custom-sized bras like these do NOT come cheap. Fortunately, my husband is able to afford them. We save a lot of money by not taking vacations anymore, which would be pretty difficult with these." She patted the tops of her boobs, sending jiggles through them. "I've been trying to wean them off," Patricia said, looking at the twins with an expression of vexation, "But the girls are quite... insistent."

Finally, Lizzie leaned back from her mother's nipple, wiping her mouth. Katie did the same a moment later, and the girls stood up. When they turned around, Denise got another shock. Both girls' bellies were distended slightly, as if they had beer guts. They had drank so much milk that their stomachs had swollen. Denise's gaze darted back and forth between them as they looked up at her, satisfaction on their faces. Patricia didn't seem to notice anything out of the ordinary. "Girls, help Mommy put her bra back on," she said, patting her breasts again. The twins spun around and began doing up the clasps. Patricia had given so much milk that her boobs must have shrunk a decent amount, for they didn't have to struggle to fit the cups back together. Once buttoned up, Patricia extricated herself from the couch and led the group back up to the girls' room.

The twins immediately began changing into pajamas once they got to their room, and crawled into bed. Denise couldn't help but stare at their swollen little bellies as they got changed, but she didn't ask any questions. Once the girls were tucked in, Denise and Patricia turned the light off and left the room, heading back downstairs to the kitchen. "They always nap for a few hours after a meal," Patricia said softly. "Now, my husband should be any minute-" just then, the front door swung open. "Oh! Speak of the devil!" she said quietly, raising a finger to her lips as she looked at her husband. The man who walked in was tall, middle-aged, and quite attractive in his fancy suit. He looked almost like Don Draper. "They're napping?" he asked softly. Patricia nodded. "Just put them down," she replied. He strode forward and took Denise's hand in a handshake. "You must be the babysitter," he said, keeping his voice down. "I'm Dan. Glad you could help out. The girls are great, but they can be a handful sometimes. Make sure you're strict on bedtime. 8pm - no later!" he said with a smile. "Honey, are you ready to go?" he said to his wife.

"Just a minute, dear. I need to leave Denise notes for preparing dinner. Would you grab my bag from my room, and my purse? I'll meet you out in the van." Dan walked quietly up the stairs, and Patricia took her over to the refrigerator, which was filled with bottles of breast milk, as well as some normal food. "I left instructions on the counter on how long to heat up the milk. Give them a bottle each for dinner. If they ask for more, give it to them, but usually they aren't as hungry after a big meal like that in the middle of the day." Patricia then began to gather her things, and told Denise she could have anything she wanted from the fridge for dinner. She showed her how to operate the TV, and spent a few minutes discussing the tendencies of each of the twins, from how they behaved to their favorite toys and activities. In the meantime, her husband got her all packed up and ready, and Patricia left an envelope of money for Denise before heading out the front door.

Denise stood in the kitchen, watching Patricia get into the van. Dan was helping her in through the side door. It was doubtful she'd fit in the front seat without her boobs squishing up against the dashboard. It took them several minutes to leave, due to the difficulty of buckling Patricia's seat belt. Finally they got her situated, and Dan closed the door and got into the driver's seat, pulling out of the driveway. They had never mentioned what kind of surgery Patricia would be getting. Maybe it had something to do with Patricia's breasts. Denise shuddered. She had always found big boobs attractive, but that was ridiculous. She liked how big her own boobs were, and sometimes even got a little envious when she saw girls who had an even bigger rack. But being Patricia's size would be a nightmare. So uncomfortable, and needing custom-made bras all the time, plus having to live in a house where they needed to widen doorframes just for you to fit! Well, maybe it wouldn't be so bad if she found a rich husband to pay for such a lifestyle. Dan must have been rich, owning one of the biggest houses in such a nice neighborhood. Plus the van he had driven Patricia away in had been a Mercedes, and the house was well furnished.

Denise realized she was rubbing her own breasts as she pondered what it would be like to have jugs the size of Patricia's. She laughed softly to herself, dismissing the thought. Patricia had had some sort of freak reaction to her pregnancy - nobody's breasts grew that much from having babies, did they? She looked down and remembered the envelope of money from Patricia she had left on the counter. Denise opened it, and gasped as she counted out five one hundred dollar bills. This was WAY too much money to be paying her for one night of babysitting. She looked at the clock. Only 12:30pm, and she was supposed to watch the girls till late that night. Patricia had said she expected to be back by midnight. Denise stared at the envelope for another minute, wondering why she was being paid so much. She had only seen the girls for a short while, but they didn't look like they were poorly behaved, and Patricia hadn't sounded like they were out of control. Well, maybe they were just that precious to their parents, who apparently had money to spare when it came to keeping their daughters comfortable.

Denise wandered around the empty first floor of the house for a bit, inspecting the place, touching knickknacks the family had left out and appreciating their lavish decorations. The kitchen was huge, with a center island, and marble counter tops. Denise turned on the enormous flat screen TV and sat down on the couch to begin searching for channels that had good movies on them. Might as well kill some time while she waited for the girls to wake up from their nap. She found a good movie, a romance flick with a hunky actor, and settled onto the comfortable couch to watch.

A few minutes into the movie, however, Denise began feeling a little guilty that she was being paid so well and was just lazing around, watching TV. She paused the film and walked upstair to check on the girls. Opening the door silently, she peeked her head in and saw that they were sleeping peacefully. Well, it had only been half an hour or so, and Patricia had said they typically napped for a few hours after their meal. Lizzie was lying flat on the bed, and Denise could see her belly protruding upwards slightly, leaving a bump underneath the sheets. These girls certainly looked like they would grow up big and strong, if they had appetites like that. Already so tall, and only 4 years old? Maybe they'd play in the WNBA some day.

Denise closed the door softly, and turned around to go down the stairs. As she did, however, a thought struck her. She wanted to see Patricia's room. She crept silently through the hallway, feeling a little mischievous. The Neelys hadn't said that any rooms were off limits, but they probably didn't want her in their room. She was curious, though. She eventually located the master bedroom, and saw that it too was richly furnished. The bed looked extremely comfortable, and there was a large bathroom off to the side of the room. Denise looked in the bathroom and saw that there was an enormous tub, which must be what Patricia used to bathe. She went back into the bedroom, looking idly through Patricia's things, before she came to a large closet door, which she opened to discover a huge walk-in closet. She flipped the light switch, and saw that the closet was filled with only women's clothes. There was also a pedestal at the end, with 3 full-length mirrors facing inwards towards each other, like the kinds tailors used to fit clothes. Patricia must need it to properly dress herself, with her boobs getting in the way.

Denise walked over to the hangars that held Patricia's bras, and felt them. They were all enormous and sturdy. There were a range of sizes, but even the smallest ones were too big to fit Denise. She took the largest one off the rack, and held it up to her chest to compare. The size difference was incredible. Denise couldn't imagine what it would be like to have tits this big. She looked at her reflection in the mirror, she grinned suddenly, having an idea. She darted into the bedroom and snatched pillows from the bed, then returned to the closet and took her shirt off. Feeling silly, she put Patricia's bra on over her own bra, the cups hanging loosely down from her shoulders, resting on her stomach. She then began stuffing the bra with the pillows, packing them in until they filled the bra. Each cup took 2 pillows, though they didn't fit very well. They jutted out from the bra, their corners sticking out at funny angles. Denise picked out one of Patricia's sweaters that looked loose, and put it on over the stuffed bra before looking at herself in the mirror.

She giggled as she turned back and forth, admiring herself. She looked ridiculous. The bra wasn't designed for her body, so it hung weirdly on her back, and the pillow just made her boobs look lumpy. But it did give her a good idea of what that size would look and feel like. Even if the pillows were much lighter than real boobs would be. She stepped up onto the pedestal, and turned around as she observed her figure. God, this looked preposterous. But on the other hand, deep down, Denise also thought it looked kind of sexy. She told herself she'd never want breasts like these, but as she laughed at herself in the mirror, she also wondered if it would really be that bad. Finally she realized how silly this all was, and she dressed back into her normal clothes, making sure to put Patricia's clothes back where she found them and making the pillows look tidy on the bed. She left the master bedroom, and checked on the girls again - still asleep - before heading back downstairs and resuming her movie.

Continued in Part 2