The battle against the Monster Association has come to a head. Fubuki, an esper hero in the b class, ended up getting mixed up with basically the leader of the association. Fubuki is the younger sister of hero Tatsumaki, she has short dark green hair, a very curvy body and wears a tight black dress. In front of her is the real leader of the Monster Association Psykos. The woman is also an esper but she was definitely stronger than her. With wavy long aqua green hair and emerald eyes basically piercing into Fubuki's soul as they had a stare down. Psykos also wore glasses, earrings and several other accessories trying to show off her superiority.
 "Hehe how pathetic! Do you really believe you have a chance against me!?" Yelled Psykos
 "Maybe not..but I'll keep you here as long as I can!!" Yelled Fubuki
 Fubuki and Psykos used their esper powers and charged at each other with Fubuki screaming and Psykos laughing. They grasped each other's hands and rocks blasted everywhere and a crater formed from their contact. Fubuki was pushing as hard as she could even surpassing her own limits but Psykos was still just smiling and started to laugh a little.
 "Give me a good warm up before I face that brat!" Laughed Psykos
 Tatsumaki landed down into the crater and crossed her arms looking at her sister struggling to fight off a weak esper. Tatsumaki sighed and a green glow wrapped around her body. She raised her hands and then the same glow engulfed Psykos. Psykos felt weaker and she blinked a few times confused. Fubuki recognized the color and knew it was her older sister. The small light green haired esper yanked Psykos off of Fubuki with absolutely no problem at all. Tatsumaki twisted Psykos around making her look at the small esper. Her arms were forced to her back and her legs were crossed. 
 "Sis you didn't need to help me yet." Said Fubuki pouting a little
 "I told you not to come here and then I find you tussling with some weak esper and you are about to lose! Ugh how annoying!" Said Tatsumaki
 Tatsumaki was about to break every bone in Psykos's body and kill her but an idea popped in her head and she looked at Fubuki thinking she needed a power up. 
 "Fubuki, open your mouth for me." Said Tatsumaki
 "Huh? Why?" Asked Fubuki tilting her head back
 "Oh just do it!" Said Tatsumaki
 Fubuki sighed and did what her older short sister said and opened her mouth up. Tatsumaki moved her finger and had Psykos's abover her sister's head. Tatsumaki turned to have Psyko's head down close to Fubuki's mouth and the tight butt was pointing toward her. Both Psykos and Fubuki were pretty confused until Tastumaki lowered Psykos even lower. The aqua green hair head started to go inside of Fubuki's mouth. Fubuki's eyes widened and her jaw started to be forced open by Psyko's head making her wince in pain. 
 "Wh-wh-what the hell are you doing!?!" Yelled Psykos
 Psykos couldn't fight back against the much stronger esper at all and all she saw was Fubuki's eyes before her vision darkened. Fubuki managed to engulf the woman's head and she gulped but Tatsumaki wasn't exactly slowing down. 
 "C'mon sis just let me put her further down and you'll get stronger." Said Tatsumaki 
 Psykos screamed as her head was shoved into the slick throat. Saliva covered her face and she cried out yelling at Tatsumaki to let her go. Of course the tiny esper ignored her and kept going, forcing the shoulders to push the mouth further. Fubuki clenched her fists and closed her eyes trying to hold the pain back. 
*GULP!!..GULP!!*
Fubuki aided her sister as her jaw managed to unhinge even more and the shoulders went down further and further. Psykos was powerless to stop the descent into the b class hero's wet gullet. Fubuki gulped hard, feeling the woman's boobs sliding into her mouth. The brushed past her mouth and since Tatsumaki wasn't exactly trying to feed Fubuki for the sake of feeding her she didn't let Fubuki have a chance to play with the tits and further pushed Psyko's down. Psykos's boobs slid into the gullet and immediately Psyko's eyes twitched and she gasped feeling her chest being pushed down. 
 "GAH!! DAMN IT STOP I CAN BARELY BREATHE!!" Screamed Psykos
 The gullet further opened up as she was pushed down even more. Fubuki's stomach groaned, yearning for Psykos. Fubuki lapped her tongue on the esper's flat stomach as she gulped further.
*GULP!!..GLRK!!*
Fubuki's dress started to push out with Psykos starting to enter the stomach. Psykos angrily yelled as her face was shoved into a small puddle of gastric juices. The walls started to expand to fit her body and Psykos found it all just to be unbelievable. Fubuki reached the hips and the tight butt sat on her lips as Tatsumaki stared unamused thinking her sister was going too slow. 
*GULP!!..GULP!!*
Fubuki managed to gulp in the ass and she knew it was almost over. Psykos felt her lower half being slurped up by Fubuki and as soon as her arms were plopped into the stomach she wanted to move around but was still unable too. Fubuki was so close as she finished up the thighs and slowly ate up the lower legs. Tatsumaki pushed the last of Psyko's into Fubuki's mouth and finally stopped using her esper power.
*GULP!!*
Fubuki gulped hard, swallowing the feet and shoes, forcing Psykos into an upside down fetal position. Fubuki had her tongue out and breathed heavily, finally getting a good breath of air. The dress didn't rip, making Psykos's bulge nice and snug in the dress. It moved around instantly and insults from the evil woman were being thrown everywhere at both Fubuki and Tatsumaki. Tatsumaki didn't care and just started to walk over to her big bellied sister. Fubuki whimpered and rubbed her poor aching jaw. Some tears came into Fubuki's eyes and she started to rub the butt imprint of Psykos. 
 "Ughh! That hurt like hell you could have undressed!" Cried Fubuki
 Tatsumaki put her hand on the belly curious to feel it too and started rubbing it too, feeling the woman inside squirming around. Tatsumaki frowned at Fubuki's comment and stared at the belly while speaking with her sister.
 "Fubuki, stop acting like a child! You know how they say no pain no gain!" Said Tatsumaki
 Inside Fubuki's stomach, Psykos was being assaulted by the bubbly gastric juices. They burned her skin as it was easily starting to digest her. Psykos used her esper powers and tried to push the gut back but they didn't help much. After her powers she went the old fashioned way and pounded her fist at the walls. 
*GURGLE!!..GLORP!!*
The sounds of groaning filled her ears and Pyskos was in disbelief that her career of being evil was ending inside the stomach of a b class hero. 
 "THIS CAN'T BE HAPPENING!! I'M NOT DYING IN HERE YOU BITCH!!" Screamed Psykos
 Psykos squirmed around and both girls ignored her words both not caring at all. Tatsumaki just kept rubbing the belly, completely intrigued with it and Fubuki looked at her sister like she was a weirdo. Tatsumaki poked and prodded Psykos's form making the esper inside squirm around. Psykos was being burned up and she was screaming in pain. Her plea of not dying inside of Fubuki was being crushed like her body as Fubuki's fast digestive system was easily working on her body. Tatsumaki was pretty shocked how fast Fubuki was digesting the woman poking the softening bulge. 
 "AHHHA DON'T FUCKING POKE ME!!! GAAAHHH IT BURNS SO MUCH!!! PLEASE LET ME OUT I'M SORRY FOR BEING EVIL I WOULD RATHER BE IN A CELL AAGGHHA!!" Pleaded Psykos
 "No no keep digesting and make my sister stronger so I don't have to watch puny people like you almost kill her." Said Tatsumaki 
 "Sis, stop teasing my food please...it's weird." Said Fubuki 
 "I fed her to you so I'll do what I want!" Said Tatsumaki 
 Tatsumaki pushed her hand into the side and a yelp came from the inside with Psykos feeling an unimaginable amount of pain. 
*GRRRR!!!..BLORP!!..SLOSH!!*
The stomach was starting to round as the woman inside was becoming all gooey and less human-like. Tatsumaki poked harder at Psykos, getting some soft whimpers as the evil esper expended all of her energy and was unable to struggle or really do anything anymore. Fubuki kept watching Tatsumaki and just had to ask her.
 "Sis what are you-bbwaarrrrppppp-doing." Asked Fubuki with a massive belch coming out as she did l
 "Look at how quickly your belly is rounding out...how are you digesting her so fast?" Asked 
 "Eh? I don't know, I guess I was just hungry after the fight." Said Fubuki poking at her breasts 
 Psykos was becoming all sloppy and goopy with her body being the only thing being digested. Pysko's clothes and other objects were being untouched by the acid basically and the aqua green haired woman was still shocked. Psykos life was on the verge of death and all she could think about was how she was about to end up becoming shit. The pathetic thought stayed in her mind until she shut her eyes and fell into an eternal slumber.
*GLURP!!..BLURGLE!!..GROAN!!*
Tatsumaki put her ear next to the belly and heard only the sounds of Fubuki's stomach groaning away. No whimpers or the sound of soft breathing remained with Psykos finally dead and just meat for the b class hero to churn down. Fubuki rubbed her belly with Tatsumaki still just watching the once curvy bulge of Psykos's starting to further round out and become all mush inside her sister's belly. Fubuki watched as the once curvy butt bulge rounded out and was all gone.
*SNAP!!..CRUNCH!!..GURGLE!!*
The bones of Psykos started to snap and break as the walls collapsed turning the goopy body of Psykos into an unrecognizable soup. The belly of Fubuki had fully rounded out in a quick half hour leaving both espers a little shocked. 
 "Huh guess she was weaker than I thought...she better make you stronger." Said Tatsumaki crossing her arms
 "Hehe yeah that would be nice but I have a feeling the only thing that's going to grow are these." Said Fubuki grabbing her breasts
 Tatsumaki was a little ticked off hearing that but for now chose to ignore her sister's oversized mammaries. A couple of bones pushed the stomach out including the lifeless skull of Psykos and a couple of other bones came with it. Tatsumaki pushed the skull back into the paste letting Fubuki further melt it down. 
*SNAP!!..GROAN!!..SLOSH!!*
Fubuki's gut was pretty much done with Psykos so it started to pump the soup through Fubuki's intestines. The gut groaned softly and it started to shrink down but other places started to grow. Like Fubuki predicted, her breasts started to grow bigger and bigger. She smiled a little concerned and held the even bigger boobs.
 "Should my breasts be growing like this? My dress feels so tight." Said Fubuki 
 Her stomach was half the size now with more of the remains sinking into her body and guts. Tatsumaki was always a little envious of Fubuki's boobs but now they were just ridiculous making Tatsumaki even more envious. Tatsumaki had to change that so she decided to make Fubuki go on a diet.
 "That's it, Fubuki. You're going on a diet!" Said Tatsumaki
 "Eh? But it was you who forced me to eat her!" Yelled Fubuki while pouting
 "You're staying at my place until...I SAY SO!" Yelled Tatsumaki ticked off
 Fubuki frowned and rubbed her belly which got even smaller. Now it was the size of a basketball and not only had breasts increased but her rear end and her thighs were getting bigger as well making her sigh as she knew Tatsumaki was going to hold the diet plan until it was over. Since the sister espers no longer needed to stay as the other heros would be fine without them, Tatsumaki took her younger sister and flew her back to her apartment. The pair arrived at Tatsumaki's apartment and of course it was an expensive place making Fubuki a little jealous.
 "Alright sis until those boo- I mean belly is all gone you are staying here until I say it's fine got it!" Said Tatsumaki 
 Fubuki could see right through her sister's true intentions and just agreed not wanting to argue with her. 
*GGRRRRR!*
Fubuki's middle made a wet disgusting sound and she winced a little having to take a massive shit. Fubuki held her belly and put her finger up to Tatsumaki.
 "Um I need to...get rid of the remains where is the bathroom." Asked Fubuki 
 "Down the hall to the left..don't make a mess." Said Tatsumaki
 Fubuki held her groaning middle and went down the hall for the bathroom. She opened the door and looked at the toilet and was astonished. The toilet was half the size of a normal toilet and looked like it was made for a child. Since Tatsumaki was so small she needed a reduced toilet. Fubuki turned back and wanted to say something but she didn't want to annoy her sister. 
 "Oh fuck it I can't wait much longer!" Said Fubuki 
 Fubuki shut the door and looked at the toilet again. Her butt was big before eating Psykos and now it was massive. Fubuki hiked her dress up and pulled her white and dark green striped panties before turning around and plopping herself on the small white toilet. Her ass cheeks almost fully hung off the sides of the toilet and it was really uncomfortable to sit on. But Fubuki didn't have a choice and just needed to unload her bowels immediately. 
 "Alright lady, get out of my ass please!!" Said Fubuki 
 Fubuki stopped holding back and immiddfly a mud slide of scat exploded out of her bottom. She winced a little as wet sloppy logs started to plop in the small toilet. After a few logs she looked between her thick thighs and she already needed to flush. Swiftly Fubuki flushed and the first of many loads of shit were sent down into the sewers. After it was gone Fubuki squeezed steamy turds out filled with bones and aqua green hair of Psykos. The once leader of the Monster Association was turned into esper scat being dumped into a small child's toilet. 
*PLOP!!..PLOP!!..PLAP!!..FLUSH!!*
Another load went into the sewers but Fubuki barely felt better. The slimy logs plopped down and pieces of her outfit torn up during digestion stuck out of the turds. The twisted glasses of Psykos popped out and were promptly buried in more shit.
*PLOP!!..SPLAT!!..FLUSH!!*
The third load was flushed and finally Fubuki felt a dent of the remains had been dealt with. But there were still lots left as Fubuki pushed turd after turd filling the small toilet again and again. The earrings of Psyko's came out and were flushed down with the fourth load.
 "Gah!! Stupid small toilet and why is there so much of you left jeez!!" Said Fubuki annoyed
 Another mudslide of shit plopped into the toilet and she didn't even notice the spinal cord of Psykos shoot out of her asshole. 
*FLUSH!!*
Load five was dealt with and Fubuki was a little less than halfway empty. Log after log stuffed with hair and bones kept unloading out. Fubuki sat on the small uncomfortable toilet for over an hour dumping Psykos out. It took fifteen flushes until she was finally at the final dump. A few wet logs came out but Fubuki had a little trouble with the final log. She grunted and squeezed as hard as she could, feeling the skull crown and slowly came out. Fubuki yelped in pain and down came the lifeless skull of Psykos piling up with a few extra turds.
  "Fuck finally! my poor ass hurts." Groaned Fubuki
 Fubuki wiped her ass and stood up to look at Psykos for the last time. She saw Psykos shoes laying on top of her skull. It survived Fubuki's digestive tract unscratched, where their owner was now stacked on Fubuki's curves. Fubuki patted her chubby belly as it groaned, feeling like it wanted to say it's proud of its work.
 *FLUSH*
She flushed again, looking as the last bit's of Psykos existence was sucked down the sewers.
The skull was smashed by the pipes and it was officially all gone. Fubuki pulled her panties up and pulled her dress back down before opening the door and meeting up with her sister in the living room. 
 "Oh you're finally out of the bathroom..I came to check on you but I couldn't get to the bathroom since that shit you took smelled diabolical." Said Tatsumaki 
 "Ha yeah thanks for that." Said Fubuki sarcastically 
 "Well did you get any more powerful from digesting her?" Asked Tatsumaki 
 Fubuki used her powers and they were the exact same with no difference whatsoever. 
 "Nope...haha I completely turned her into fat and shit." Said Fubuki 
 Fubuki groped her massive tits and squeezed them before turning her butt around and slapped it making the massive thing jiggle. Tatsumaki found that super annoying and the fact the belly that was the size of a basketball was all gone after the shit reduced to a small pot belly was even more annoying. Fubuki enjoyed her jiggly body and wondered if she could get Saitama to look at her with it. But Tatsumaki wanted nothing to do with that thick body and stood up pointing at her sister.
 "You aren't leaving until you are back to normal!!" Yelled Tatsumaki 
 "Ehhhh? But I like my new body look at how thick i am...I do need a new dress though" Said Fubuki grabbing her butt and making it jiggle a little bit
 "Gah that's exactly why!! You will not be any thicker than usual!!" Said Tatsumaki super jealous of her sisters body
 With that the Monster Association was defeated and Fubuki was on weight watch with her older sister.