Chisa was sitting downstairs watching TV with boredom in her eyes, sighing in annoyance she tried to think of what to do when with the audio stopping on the tv for a moment a squeaking bed was heard upstairs. She looked up the stairs and got off the couch, turning the TV off. She got up and walked upstairs. Opening her sister Nanakas door she gasped seeing her and her friend Azusa having sex, and the worst part was that Azusa was wearing her clothes. 
 "Nanaka!! What the hell is this?!" Chisa yelled, both girls screamed as they jumped up not noticing Chisa opening the door. Nanaka blushed as she looked at her younger sister. 
 "A-Azusa agreed to help me fulfill my fantasy. I have an undying fetish for you. So I gave Azusa some of your clothes and we started having sex" Nanaka said, Azusa remained silent but she blushed heavily. Chisa growled at the two before she locked the door and walked over to them, she grabbed Nanaka by the shoulders.
 "This is what you get for having sex with my friend!! And for being a freaking creep!!" Chisa yelled before she opened her mouth disturbingly wide, Nanakas eyes widened before she screamed. But she was quickly muted as Chisa closed her mouth over her sister's head, her cheeks puffed out before she took her first swallow and got over her sister's shoulders. 
 *Gulp..Slurp..Gulp..*
Chisa continued swallowing her sister, feeling her insides shifting around as she got past her sister's boobs and began swallowing her sister's belly. Nanakas legs flailed and kicked around as she tried to get out of her sister's throat, but it was pointless as she entered Chisas belly with it bulging out on the outside. Azusa was speechless as she saw Nanaka being devoured, she wanted to run but her body wouldn't respond. 
 *Gulp..Gulp..Gulp..*
Chisa swallowed down her sister's rear end and began slurping down her legs, upon reaching her feet she closed her mouth and swallowed one last time tracing the bulge down to her stomach. Her stomach hung down to the floor from her torso, wiggling and thrashing around as Nanaka screamed. 
 *BOOAAAAAAAARRRRRRRPPPPPP!!*
Chisa belched, spraying Azusa with saliva, the purple haired girl groaned as she whipped the spit off her face.
 "Really Chisa?! That was gross!! Where are your manners?!" Opening her eyes after cleaning her face, all Azusa saw was Chisas gaping maw, she screamed out much like Nanaka before Chisa clasped her mouth over her friend's head. 
 *Mmmmph!!!*
Azusa yelled down Chisas throat before she swallowed, getting over her friends chest easily the girl kept swallowing Azusa who continued fighting back. 
 *Slurp..Glug..Gulp..*
Nanaka continued screaming before Azusas head entered the stomach with her, Chisa kept going at it until she swallowed her friend's ass and slurped her legs down. Tracing the bulge down her throat Chisa sighed before she muffled a burp, she looked down at her giant squirming gut before patting it lightly. 
 "This is what you two get! Now just keep struggling and digest for me! At least it will be pleasurable to one of us!" Chisa said, Nanakas head bulged out and she punched the walls. 
 "Chisa!! Let us out!! I'm sorry!!" Nanaka yelled before Chisa pushed her head back, Azusa then yelled before she kicked at the wall as well. 
 "Come on!! You're being ridiculous!! Especially for me to be here!! I was just doing your sister a favor, why am I here?!" Azusa yelled, Chisa groaned in annoyance before she slapped her belly. 
 "You're in there for being a creep like my sister, and for following along with her sick fantasies!!" Chisa said, inside her belly something dropped onto Azusas leg before more began dropping. A pool of acid began rising, making the two start struggling more. 
 "Chisa!! Please!! If you let us out I promise I'll make it up to you!!" Nanaka begged before Azusa joined in.
 "I-Ill do whatever you want!! Just let me out!!" Azusa yelled, but their cries fell on def ears as Chisa ignored them. 
 *Gurgle..Glorp..Groan..*
 Chisas belly groaned loudly barely muting the two inside her, she kept burping due to the constant movement in her belly. "Stop wiggling around so much!! Your- Blep!! Making me gassy!!" The girl said before she slapped her belly again, the twos struggling slowly began to lessen due to their air being burped out. 
 "LET US OUT DAMN IT!!!" Nanaka screeched as she began melting, her skin melting off her along with her hair melting off her head. Azusa fared no better as she slipped into the acid feeling her arm go numb and melt off, both being blind by the darkness began unknowingly fighting. Both screamed in agony as they began breaking apart. 
 "FUCK YOU CHISA!!!" Azusa yelled before their prison rumbled. 
 "Yeah well screw you too. You both deserve this for being fucking creeps" Chisa replied, rubbing her belly teasingly. 
 *GRROOOOAAANNN!!..*
Chisas belly groaned loudly before aggressively compressing, slightly with a loud snapping sound from her belly, along with the screaming stopping completely. Chisa sighed as she knew both of them were either dead or had given up, inside both were on the brink of death. 
 "S-Someone. Help us!" Nanaka groaned, her eyes barely staying open as she kept bleeding out and digesting. 
 "C-Chisa. Let..us..out" Azusa whispered before her and Nanaka collapsed into the acid feeling light headed, the acid rising over them before it flooded into their mouths quickly drowning them. 
 *Churn..Snap..Churn..* 
Chisas belly groaned with snapping and sloshing, she rubbed her belly and put her head against it listening to the noises. She smiled listening to the snapping and sloshing, she then watched as her belly began shrinking making her breasts grow out. Outgrowing most of her shirts she groped herself before feeling her ass and thighs grow out as well, she felt her ass firmness and bounce and grinned. 
 "I'm guessing you went on my ass Nanaka!! And Azusa must have added to my breasts!!" Chisa said before she felt waste build up in her intestines, she groaned as she squatted down. "Knowing there's bones in me, this is going to hurt!" Chisa moaned as she began pushing, however all that came out was gas. She grit her teeth as she kept pushing, one by one long thick logs of crap dropped onto the floor full of bones, cloth fragments and hair. 
 *Plop..Frt..Plop..*
Chisa moaned as she kept dumping out her sister and friend, once and awhile farting which made her hold her nose. The crap kept piling up as she continued, it eventually began to feel good to her. Her hand began to go down to her pussy before she started rubbing it, making her moan softly. 
 "O-Oooohhhh. Yes Nanaka. Slide out of me" Chisa said as the pile continued rising, her breathing became heavy and sporadic as she masturbated harder. While she was doing that she pushed out two skulls that landed on top of the pile, before two turds landed on top of them. 
 "Yes!! Yes!! YES!!" Chisa yelled before she orgasmed on the pile, her liquids landing on the skulls before she calmed down. Sighing in relief her mind began to straighten out, she turned around and nearly gagged having forgotten what she was doing. 
 "God!... You two smell awful!! I-I gotta get out of here before I throw up!!" She said before she rushed out of the bedroom, closing the door behind her she quickly went and got into the shower to clean her rear end off. While she was cleaning she had more time to inspect her upgrades, she smiled softly as she scrubbed her body clean thinking about how her sister and friend were now a part of her. 
 "You two look better like this, it sucks for me though that I have to clean that mess in Nanakas room. But oh well, and I need bigger clothes. But since you took some of mine Nanaka, I'm sure you'd be ok with me stealing some of yours!" Chisa giggled to herself, after cleaning herself she spent most of the night and the next day cleaning up her mess. Putting the remains in trash bags, throwing them away then scrubbing the floors. 
 Once finishing Chisa got ready for the day putting on Nanakas clothes, throughout the day she was mistaken for her sister by her other friends. Most of them she ignored, but it was annoying that they couldn't tell the difference between the two. However, her annoyance quickly developed an idea in her head, pulling her phone out and she began texting all of her, Azusas and Nanakas friends sending them a quick message. 
 Party at my house, make sure to bring snacks. She sent, the day went by with no responses from anyone. But she was quickly proven wrong as late at night the door knocked, Chisa groaned in annoyance before she got up and opened the door to see all the people she contacted. She smiled seeing all the snacks they brought, she licked her lips. But not at the food they brought, it was going to be a fun night for her.