A strange feeling in her chest

Something strange was happening to her chest and although it felt good, it was different. Momo was currently too busy paying attention to her arm to notice though, watching each of the muscle fibres multiply, pushing her soft skin forwards in all directions. Watching her veins becoming more prominent on her growing mass of an arm. Watching her power increases. But her attention was ripped away from her now 37-inch bicep towards her pecs when they started to grow at a rapid rate. Her mind was overfilled with pleasure as she fell to her knees, eyes fixated on her chest. Every inch they pushed forward caused to unleash moan that would be able to shatter glass, but it wasn't only the growth of her muscles causing this pleasure, no something more unexpected was happening, her tits started to sink into her pecs, decreasing in size. Momo realised this fairly quickly and was filled with a mixture of panic, horniness, pride, fear, and lust all at once. There was once thing she was sure of though, that she was enjoying her tits while they were still there. Quickly she placed both her hands on her still massive breast and began to caress them. Quite aggressively, she jiggled them up and down while rubbing her erect nipples. She felt as they were both pushed forward by her budding, mighty pecs and as they slowly shrunk and it felt good. In an attempt to convince herself otherwise while at the same time being a point of legitimate concern, between her orgasms she managed to utter "please no *UNG* this is too far." At this point in time worry was winning out. Momo was always secretly quite proud of her massive tits, always being willing to show them off (there was a reason her hero custom had no zip). She even enjoyed their new size, so to lose them wasn't something that she wanted, or at least that was what her head said. The rest of her body loved it. Her pussy was as wet as a waterfall, and in an attempt to pleasure it she resulted to rubbing her developing thighs together to take her mind off it. At least she managed to keep herself off the floor this time, but the pleasure was still much greater.

Since Momo was so focused on her chest she didn't have much time to focus on the rest of her burgeoning body. Even her arms had a hard time pulling her attention away from her chest, and they grow a lot. Her bicep's veins grew even larger and thicker and more blood went through to return to her heart, all of which was needed for the amount of muscle mass added to her. Trying to regain Momo's attention, it constantly pushed forward and forward, trying to reach the greatest heights possible, being big enough to even rub against her tits and pecs while pleasuring them. Her tricep did the same in the opposite direction, creating a small sound with each muscle fibre gained due to the speed.

But not even this was enough for Momo to break her attention away. No not her, 63-inch thighs wet with sweat, nor her 33-inch calves, or her wide hips and large ass beautiful ass, or her even thicker 6 pack, or her 40-inch shoulders, or her back slowly closing the distance between itself and the neck, or even her previously mentioned 45-inch bicep and 60-inch tricep stood a chance at breaking her attention away from her chest. Though at this point she was focused to meet the demands of her pussy moving her left hand from her breast down to it so she could start fingering herself. This was perfectly timed by a complete coincident, as a massive period of expansion was about to take place.

At this point, her breast was still large enough to be called an E cup meaning her hand could easily be placed around it in some extra room. But with only a vague feeling to prelude it, it shrank a whole cup size and her chest grew 3 inches in a blink of an eye. Of course a loud moan, in fact, the loudest so far, was realised from Momo. It felt amazing. Though it was only her chest that grew (well apart from her breast) all over her muscles grew by a couple of inches. Hell, her width and height also increase by a lot as well. Jumping up a whole extra foot in height and gaining 1/4 of a foot in width. Momo didn't really have any time to think about well anything since it only took a couple of seconds for it to happen again. The moan was louder this time, pushing her feminine voice to its limits. Once again her tits sunk into her pecs as they jolted forward, taking up the space her breast used to occupy and then some. Momo now understood that this was the last phase of growth, not just due to the speed but also how good it felt. Wanting to enjoy the last moments with her breast she quickly took to giving them one last massage with her large powerful arms. Though as soon as she started to do this her tits once again shrank now becoming B cups, meaning her hand could just about feel her pec as well now. This time it felt good enough that her whole body had to stop moving, though the amount of muscle she put in such a short time also played a role. Tears, partly of joy, partly of fear, rolled down her as she tried to prepare herself for the two jolts of growth, though she was unaware of this. The next phase felt better than the last, with her body growing even more than before. Her once large breasts were now reduced to two small mounds of fat sitting on her superior pecs. In her mind, she thought this would be the last surely she wouldn't become completely flat-chested, right? She was quickly proven wrong, as 8 seconds later her breast would finally be consumed, who body forcing her to celebrate with a barbarous moan, that sounded more animal than human.

She collapsed on her knees for a moment and took a deep breath. Her mind was still in a state of arousal and she tried to bring it back into order. Once she did she took stock of the new body. The first thing she looked at was her absolutely breathtaking pecs, they were large enough that she could no longer see below. Although she didn't have the ability to measure them she could they could win records, luckily I can. Her chest was 185 inches, although a bra would be useless for her if she wanted one she would be out of luck as nothing would be big enough to fit around her. Momo didn't know how to feel about it yet. For one she was worried she would look too masculine without breasts, especially with a body as muscular as hers. She also worried about what all her friends would think of her, or even if her new pecs would be useful for hero work. Though she decided the easiest way to decide was simply to feel them. With great care, she placed one of her hands on her pecs charting the areas where her breast once laid. It was obviously hard, but she expected that, what shocked her though was her soft skin and the sweat coating it gave it a silky feeling. This alongside the warmth generated from her colossal chest start to turn her on. She was a bit embarrassed by this, I mean she was literally turned on by herself that's slightly egotistical. She considered touching her nipples but she decided that she was already incredibly horny, they were no reason to become more so. But she couldn't resist but giving her chest a quick flex, she placed both her hands at the bottom of her pecs and started to flex. "UNG!" she couldn't help but moan at how good it felt to make her chest larger and to feel it in all its glory. She suppressed these feelings, for now, she had private time later where she could have a lot more fun with herself or perhaps somebody else. Once she stopped though something seemed to click in her brain. She's massive, absolutely massive. Even on her knees, she was above the oneway mirror, she had to be around 12 feet. Her neck was thick with muscle and veins and was protected not only by her massive pecs but also her massive traps. They were large enough to go beyond her neck and were even getting close to her head. In terms of her width, her shoulders added a lot to her (alongside her hips), being around 130 inches each meaning her body was about 9 feet wide, quite a power figure. But it wasn't just powerful, her larger hips still made sure that she looked feminine even if in a more non-traditional way. She also started to appreciate just how large her arms were now. Her 80-inch biceps put every pro hero to shame, not to mention villain. Most would think she would've had a strength quirk with a body like hers. She pulled her arm up to head for a quick flex and watched it jump up by 20 inches. Somehow her bicep became even more defined, with her veins becoming almost completely visible to the outside world. Momo had to bite her lip in order to control herself, though she couldn't resist giving it a quick kiss, and brushing her 110-inch tricep with a quick arm. While bringing her arm back into place she bushed abs and noticed something different. Of course, the entire body was different at this point but she felt a certain sense of pride from this, her six-pack had become an eight-pack. She stopped flexing her bicep and used both hands to feel herself up, making a variety of "ums" and "aws" as did it. While she busy feeling up her abs she decided to look lower down at her legs. She already knew they would be strong and powerful but much so? She was quite impressed, to say the least, her thigh was around 156 inches and was large enough to get rid of her thigh gap. Going lower than that her claves were around 80 inches. The entirety of her legs was still covered in soft white skin, which contrasted with her mighty blue veins and strong powerful muscles.

But while Momo was busy checking herself out, Mei was doing the same. Throughout the whole second phase, she couldn't help but touch herself, not even wanting to move to grab one of her "special" inventions. She never thought much about her sexuality always thinking she was straight, but the first phase made her doubt that and now the second shattered it. Though she was glad her machine was a massive success she was left with a question what now? Part of her wanted her to jump in there and worship and fuck the beautiful women in the other room but another want to let her conduct some field experiment on her own, or maybe even gather some new subjects. Part of her even wanted to get in the machine with Momo giving them both another dose.