Yui and Ui Hirasawa had been very close sisters for a long time, always taking care of each other. Although, it was mostly Ui taking care of Yui. Both girls were difficult to tell apart if they had their hair down so Ui usually wore a ponytail. One big difference between the two of them is how much larger Ui's boobs are. The two of them both have brown eyes and thick medium brown hair that's about shoulder length. Yui is often seen with two yellow pins in hers.

After school, Yui puts her stuff away and wonders what the two would do for dinner before thinking about all the nice things Ui had done for her, so Yui decided she wanted to make dinner for Ui. Yui left her room and headed past the living room and found Ui walking toward the kitchen.

"Hey Ui." said Yui.

"Sis?" responded Ui.

"I want to make dinner tonight." answered Yui.

"I don't know about that." responded Ui, "You're probably just going to make a mess. What were you planning to make?"

"Well, I uh… I wanted to be your dinner, Ui!" answered Yui.

"...! Um… okay." was all Ui could say.

"So can I please be your dinner?" asked Yui.

"Why do you want to be my dinner?"

"Because you're always doing all these nice things for me so I want to do something nice for you too!"

"Well… alright. You can be my dinner tonight, Sis."

Yui smiled and then took off her clothes and stood before her older sister in nothing but a pink bra and panties. Ui then followed by removing her shirt and then her skirt. Ui was wearing only a light green bra and light green panties. Yui looked straight at her sister's cleavage, feeling a bit jealous that her sister was a bit bustier. She took her mind off of it when suddenly she was looking down her sister's throat and beginning to slide past her tongue.

Ui swallowed her sister's face and Yui smiled as she began sliding down the esophagus. Her younger sister gulped some more getting to her shoulders, getting them in easily. The girl gulps her sister down some more, getting her prey's boobs inside. Some more swallows get Yui's stomach into her mouth. Ui just keeps going, letting her sister's panties enter her mouth next and then works toward her knees. As her sister filled her up, her belly stretched and Ui enjoyed the feeling.

She got past her sister's legs and with a few more swallows sent the rest of her sister inside of her belly. Yui landed in her sister's stomach acid. It was wet, tight, slimy, and smelly inside but she managed to get herself upright and comfortable. She started massaging the walls of her sister's stomach, waiting to be digested. Ui sat down on the couch in their living room, rubbing her belly, happy to be full.

"You were delicious, Sis." commented Ui.

"Really?" responded Yui, "I'm glad."

"So… I digest you now?" said Ui.

"Yeah." answered Yui, "I'm in your belly, so I'm food now."

"I see." said Ui, "Well, have fun in there."

Ui went and sat down on their couch, and began rubbing her belly. Yui could feel the movements of her sister's hands. The walls of her sister's stomach wrapped around her, squeezing her tight and then the acid started rising and bubbling. Yui knew it was happening. She was about to be digested… and she couldn't wait! The acid rose up past her belly button and then it started working. Her flesh was starting to soften, pieces slowly coming off of her body.

Her panties were forming holes in them, her exposed skin turning red. The acid broke down pieces of flesh and bone and somehow, it wasn't unpleasant. Yui enjoyed the feeling of being digested by her sister! The pace of digestion picked up and Yui was tossed around, acids splashing all over her. Soon her bra was digested off and then the movements in the stomach pushed Yui down under her sister's stomach acid.

"You enjoying being digested?" her sister asked.

She only got gurgles as a response.

"I'll take that as a yes." said Ui, letting her belly continue digesting her.

Then Ui let out a loud belch, and her sister's pink bra and panties came out of her mouth and onto the couch. There were holes all over both of them due to being in her stomach acid. This was when it really sank in for Ui. She really did eat her sister. She really was digesting her. And she loved it! Inside, Yui was having the time of her life. Her now naked body was tossed all over, even more flesh broken off of her and being turned into an unrecognizable mess.

Ui's belly slowly shrank over time, due to her sister's new form not taking up as much space. That and her flesh was already starting to go through her intestines. Yui couldn't say anything to her sister at this point, because it would only come out as gurgles, so she just relaxed and let her consciousness slip away. Her messy form would be fully digested later. In the end, Ui was glad her sister decided to do this.