Fubuki, the little sister of Tatsumaki sat in her quarters with two bodyguards nearby. At the top of her rank at B Fubuki organizes most of the class B heros to help rank up but also to reign supreme over them. Fubuki was always jealous of her sister for being so much more powerful then she was. The spotlight always fell onto Tatsumaki and she of course loved her sister but her dream to be at the top made her want to get rid of Tatsumaki. Fubuki already had a plan in motion and was waiting for the results.
*CRASH*
Fubuki looked up with a surprised look at the room beyond them and heard a loud bang. The screams of her men had her worried.
 "The both of you go out and find out what's happening" said Fubuki
 They nodded and ran towards the door but a green glow wrapped around it and then it was pushed open. The bodyguards looked in fear as Fubuki's older sister, who looked younger stood before them.
 "Out of my way weaklings" said Tatsumaki
 Tatsumaki threw them away with her esper power and floated towards the curvy Fubuki. Fubuki leaned back in fear as her plan must have failed.
 "My weak idiot sister, did you really think that was going to work" said Tatsumaki
 Fubuki was sweating bullets now and could not respond.
 "It doesn't matter I don't need you coming after me all the time so I'm going to end this right now" said Tatsumaki
 Fubuki felt herself being lifted to the air as Tatsumaki's feet touched the ground.
 "Wait..what are you doing" said Fubuk
 "Getting an upgrade that I deserve" said Tatsumaki
 Tatsumaki opened her mouth and her pink tongue came out. She tilted her head back and put Fubuki right over her. Tatsumaki lowered her sister down letting her feet slide into her maw.
 "NO WAIT PLEASE DON'T EAT ME" yelled Fubuki
 Tatsumaki felt Fubuki's feet opened her gullet and started to go down. Tatsumaki moaned a little bit and then continued to force her sister down her throat. Fubuki tried using her own esper power but it was nothing against Tatsumaki. Tatsumaki swallowed up Fubuki's lower legs and reached her fat thighs. Fubuki continued to plead as Tatsumaki wet tongue glided over her legs as they went down the slippery throat. Fubuki felt her feet go into her sister's stomach and pushed against the walls. Tatsumaki's belly started to push out as she reached her sister's ass and gulped it down.
 "IM NOT FOOD TATSUMAKI IM YOUR SISTER STOP" yelled Fubuki
 Her pleas meant nothing to Tatsumaki as she started on Fubuki's belly and arms.
*gulp...glrk*
Tatsumaki swallowed more, filling her gut up with her own sister. Tatsumaki liked that thought which made her wet down in her panties. Fubuki's large tits hit Tatsumaki in the face and made her growl. Using her esper power she forced them to be squished down making Fubuki yelp in pain and pleasure.
*gulp*
Fubuki's bust went down Tatsumaki along with her shoulders. Tatsumaki's lips wrapped around her sister's neck.
 "Please dont" said Fubuki
 Tatsumaki laughed and then pushed Fubuki's head into her mouth and swallowed. Tatsumaki slurped the last bit of her and gulped her down for good. Fubuki cried as she slid down her sister's gullet and ended up curling up inside of her sister's stomach.
*rrrriiiipppp*
Tatsumaki's black dress she wore ripped open as her large belly spilled out in front of her.
 "Tasty but now I have to get this fixed, truly you are a pain" said Tatsumaki
 *gurgle*
Only a muffled plea and the sounds of digestion came from within. Tatsumaki smiled and felt something coming up her throat.
*bwarrappppp*
Tatsumaki belched loudly, ridding her belly of most of the air. After a minute or two Fubuki's struggles weakened tenfold. With the lack of air her strength just went away. The squirming of her prey made Tatsumaki horny so she floated over to the couch and sat down. She used her esper ability to fetch a dildo nearby and slipped her panties off. Tatsumaki moaned as the tip went inside her pussy.
 "I always knew you had one laying around" said Tatsumaki making it penetrate her
 Fubuki could hear Tatsumaki's moan as she fucked herself to her own sister's demise. The digestive organ rubbed itself over Fubuki's entire body and coated her in stomach acid. It was eating away her softening her up. Fubuki's clothes started to rip and tear open leaving her skin exposed. Fubuki fought back pushing the walls back but it didn't do much. Gurgles and squelches filled her ears as the stomach digested her.
 "Sister please don't melt me to mush I beg of you" said Fubuki
 Tatsumaki was too busy listening to her stomach digest and the dildo inside her to even listen. A pool of pussy juice was under her and Tatsumaki's eyes rolled back with her tongue out moaning loudly.
 "Fuck yes my sister melting away within my small body...churning her up into goop and shitting her remains...oh fuck happen faster" moaned Tatsumaki
 *blorp..churn*
Fubuki heard those words and knew it was the end. Tatsumaki was enjoying her death and Fubuki could do nothing but wait. Fubuki stopped fighting and accepted her new role as meat for her sister. The walls pressed against her and squeezed her hard. The acid was slowly rising but now belly was squeezing really hard and she felt something happening on the outside. Tatsumaki yearned for digestion to happen faster and so she used her power and was forcing the stomach walls down on Fubuki to crush her down. Fubuki yelled as her body was pressed more into a ball and then snapped. Tatsumaki heard her sister crunching up into a ball and she cummed to the sound of breaking bones. Tatsumaki forced her belly more and turned her sister's body into a ball of meat and bones completely submerged in stomach acid.
*glorp...groan*
Only little bulges remained of Fubuki's body remained. Fubuki's body was all mangled and the acid was working fast, melting all the soft bits off. Soon enough only bones remained of the top class B hero. Fubuki's bones pressed against Tatsumaki's belly and she used her power to break them down even further trying to leave little left of her sister. Digestion took around three hours until Fubuki was ready to enter her sister's intestines. As the round soft belly of Tatsumaki shrank her bust and thighs started to fatten out. Tatsumaki was more than pleased with her G cup tits and fat thighs with a round ass to go with.
 "This is where you belong sister, on the best esper in the world" said Tatsumaki slapping her jiggly ass
 *frwapppp*
Tatsumaki farted and smiled knowing what was next. Tatsumaki floated in the air and lifted the bottom of her dress. With her own hands she spread her fat ass cheeks and felt scat coming. A brown turd pushed out of Tatsumaki and fell to the ground with a splat. Tatsumaki giggled seeing dark green hair mixed in. Wet logs of poop started to exit her rear and pile up on the ground. The class B hero was reduced to nothing more then shit piling up under a class S hero. The wet slaps of shit hitting the ground was making Tatsumaki horny again but she didnt feel like fucking herself again.
 "Feeling you come out is wonderful sis" said Tatsumaki
 There were no hard bits of Fubuki left and only hair remained.Tatsumaki then let her ass go and a golden stream of piss shined the shit up. Tatsumaki finished up and got toilet paper from another room to wipe. With her business done Tatsumaki flew out with enhanced assets and a smile.