Zuikaku laid on the bottom bunk of her and her sister Shoukaku's private quarters. Zuikaku was currently lost in thought with one of her brown twin tails hung off the side of the bed and she had her white coat on the floor only wearing a tight red dress. Shoukaku had been standing in the door frame just watching her sister worried about her. Zuikaku suffered a devastating defeat at the hands of Enterprise not long ago and usually that makes her pretty upset but this seemed worse. 
 "I'm not strong enough" thought Zuikaku 
 Zuikaku tried thinking of other ways that might have aided her but all came to the same conclusion that she didn't have enough power. Zuikaku has been thinking about it for hours now and Shoukaku didn't know what to do. Shoukaku brushed her long white hair back and straightened her white kimono just in case Zuikaku needed something. Eventually Zuikaku's thoughts arrived at her sister and she started to think about Shoukaku's role. During that fight Shoukaku didn't really do much and was pretty much useless even when she tried. Zuikaku kept thinking of previous battles and could never really pinpoint a single fight where Shoukaku was really of any use. Zuikaku wondered what she should do about that and kept thinking of different things like putting in charge of other things but that didn't sound right. Finally a single thought landed in her mind and it seemed to be the best option yet. Zuikaku would add Shoukaku's power to her own and with that boost she would be able to fight Enterprise and have a chance. Zuikaku sits up and Shoukaku immediately goes over to her.
 "Zuikaku are you okay is there anything you need" asked Shoukaku 
 "I'm alright but there is something I need can you close your eyes" asked Zuikaku 
 Shoukaku was a bit weirded out but she nodded her head and shut her eyes tight. Zuikaku claps her hands together softly and rubs them up and down and licks her lips making them all wet before parting them and widening her maw. Shoukaku felt a little weird feeling her sister's hands on her shoulders and wondered if she was going to kiss her. Shoukaku even puckered her lips just in case even if it made her look silly. Zuikaku saw it and definitely felt a little bad that she was about to eat her sister but it was a necessary sacrifice to finally defeat Enterprise. Instead of her lips getting wet Shoukaku feels her face and eventually entire head get wet and pushed in somewhere tight. Shoukaku opened her eyes to find herself inside her sister's mouth. Shoukaku screamed and started to squirm, swinging her arms around. Zuikaku was definitely surprised at the pretty tasty flavor of her sister. To prevent Shoukaku from escaping, Zuikaku gulped in the entire head and her neck expanded out with her sister's terrified face. 
*mmmppphhh*
Shoukaku's voice and screams were muffled a bit but Zuikaku still understood the basics. Zuikaku moaned at the yummy taste and was really getting into it, slipping her hands down her sister's kimono and feeling the soft breasts up. Shoukaku yelped and squirmed even more from it as she didn't want to be assaulted and eaten. 
*gulp..gulp*
Zuikaku had fun groping her sister's tits but she had to continue swallowing or Shoukaku might still escape. Shoukaku's shoulders were swallowed and little by little her arms were forced down rendering them useless. Saliva ran down Shoukaku's body into the kimono and down her breasts as Zuikaku wetly devoured her whole body. Shoukaku's boobs were forced down into the maw squished by the cheeks before being pushed down to an even tighter tube. Shoukaku yelped, having trouble breathing inside of the gullet.
 "Stop please..it's hard to breathe" muttered Shoukaku
 Zuikaku already made up her mind and continued on lifting her sister off the ground and swallowing her midsection. It was nice and tender, making saliva gush from the sides of her lips. 
*gulp..gulp*
Zuikaku felt her stomach expand a bit as her screaming sister was pushed inside. Shoukaku yelped as the moist walls of the stomach grabbed her face but each gulp made them push out further and further. Zuikaku grabbed onto both of her sister's ass cheeks and clapped them together teasing her thick sister as she swallowed the belly button. The red dress pushed out further with each gulp and as Zuikaku reached the large ass her dress ripped and the bare belly was exposed. Zuikaku slurped the ass in and swung her head back quickly making the sandals Shoukaku had on fall off. 
*gulp..gulp*
The ass was squished into the tight throat and Shoukaku was curling up in her sister's stomach with seemingly no way out. The legs were in the air and Zuikaku held her large growing gut while watching the dangling feet in the air get closer. With each gulp they inched closer until the toes brushed against her lips and disappeared into her waiting mouth. The lips were sealed shut and Zuikaku swallowed one final time. The last of Shoukaku curled inside the tight wet stomach with her knees touching her face and her breasts were pushed down by the legs. The uncomfortable fetal position made Shoukaku tear up and she can't understand why on earth would her own sister eat her. 
 "Why Zuikaku..why would you eat me I'm your sister" said Shoukaku 
 "I'm sorry but I need to defeat Enterprise...so I ate you and I'm going to digest you and absorb your power so I can finally defeat her and that's the truth" said Zuikaku
 Shoukaku couldn't believe such a shallow selfish reason was going to lead to a digestive demise. Shoukaku though wasn't going to let it happen easily and started to struggle and scream hoping someone would hear her just a little bit. But it started to have the opposite effect as Zuikaku bit her lip while blushing and actually moaned. Shoukaku moving around in her stomach felt severely pleasurable and her panties were getting soaked. Zuikaku wanted to masturbate but she felt it was cruel to do so to her own sisters screaming.
 "Please..Shoukaku calm down and let my stomach take you it'll make it easier for the both of us" said Zuikaku 
 Shoukaku refused to do so and Zuikaku couldn't help it and laid on her back before having her hand go under her gut and started to masturbate. Zuikaku moaned at the amazing feeling and was in a more cruel thought process, fully enjoying her sister being digested. 
*bwarrrrppp*
Zuikaku belched loudly and with her tongue she kept masturbating to the screams and gurgles coming from her belly. Shoukaku was feeling her skin burn as digestion had started. Her kimono was ripped and melted a bit as acid rubbed on her bare skin. It hurt and it was only getting worse for her. 
 "Please have mercy I'm your sister please" begged Shoukaku 
 "That's it..squirm and become mush" moaned Zuikaku 
 Shoukaku cried out as the pain was starting to become unbearable as she thrashed around. Her skin turned a little pink and became softer every minute. Shoukaku's hands and face bulged through the stomach as she screamed at the top of her lungs only making Zuikaku moan and with her free hand push the imprints down.
*gurgle..glorp..churn*
The stomach noises filled the entire private quarters drowning out the painful screams. After an hour of masturbating Zuikaku finally orgasmed moaning and her stomach clamped down on Shoukaku making her scream. Inside Zuikaku was a rough sight of the stomach a quarter way full of acid and Shoukaku crying in pain with half her kimono in tatters. 
 "Fuck..it hurts..please..don't digest me" begged Shoukaku 
 Shoukaku could still move and squirm weakly punching the walls making acid splash back at her. Zuikaku panted with juices on her hand and some running down her leg. It just felt so good but after orgasming she wasn't as horny and had a more clear mind. Zuikaku gave her belly a few slaps trying to aid in digestion and hurry it up. It took another hour and half before Shoukaku went completely limp as her body became too soft. Without her moving she cried as the walls continued to push her into a tighter ball. She cried out for Zuikaku one last time before she broke. The stomach walls killed Shoukaku and the acid had mostly filled the sack at this point. Zuikaku rubbed her belly as her sister's bulges rounded out and became soft.
*slosh..crack..snap..blorp*
Shoukaku was churned down into some unrecognizable slop of meat, bones and hair pretty quickly. Her new form sloshed around inside of Zuikaku as she laid on her side now. The rib cage bulged against the belly walls and it groaned a bit. 
*bwarp*
Zuikaku belched one last time before a loud stomach groan came from inside her and the mush flooded through her guts. She moaned and gripped her shrinking belly feeling her assets starting to grow. Zuikaku's tits grew bigger and bigger making them nice and soft. They almost snapped the bra but they just spilled out a little. A nice big ass came on Zuikaku which ripped the panties off and half her ass stuck out of the short dress. But the best part was the overflowing power Zuikaku received, making her smile. It definitely was enough to defeat Enterprise now.
 "Finally Enterprise will fall before me" said Zuikaku
 As she stood up to monologue her plan out loud she felt her sister begging to be released from her back side. Zuikaku lifted her dress all the way, letting her fat ass free. She just goes ahead and half squats over the middle of the floor and pushes. A sudden moan escaped her lips as immense satisfaction and pleasure came from pushing fat turds out of her. Shoukaku was so soft and creamy coming out of anus like a constant flow of chocolate soft serve ice cream. Mixed in were small bone specks and little white hairs that survived digestion. Zuikaku grabbed the edge of her bed and shot her ass in the air moaning as the soft poop plopped on the floor. 
*plap..thud..thud..plap..plap*
The kimono Shoukaku wore came out stained and mixed into a large soft turd making Zuikaku wet once again. The juices from her pussy falling to the ground. Shoukaku's ribs smeared in scat dropped from the ass and were buried in a torrent of turds. 
 "Yes come out of me sister...fuck never stop coming out" moaned Zuikaku 
 Zuikaku orgasmed as a solid object made its way out. The cum splattered on the floor and Shoukaku's brown stained skull topped off the pile. The shit was over and Zuikaku had no idea what to think. She turned to see her sister's skull looking at her and frowned.
 "I'm sorry for turning you into shit but that was greatest thing I've ever felt and with this power I gained from you I shall defeat Enterprise" said Zuikaku 
 Zuikaku wiped her ass clean with her own panties and stood up putting her dress down and getting her white coat on. The fat of sister added on her jiggling with each step and now Shoukaku can be of some use. She left the pile of shit alone and someone else could deal with it.