Sothis is a strange girl who one day started appearing within Byleth's dreams and eventually started to communicate with them through their mind. She seemed to have lost her physical form long time ago and now exists as a spirit, though she cannot remember much about her past. One day, she suddenly woke up in a different world from her, the world of Zenith. And to her surprise, she has gained a new physical form to interact with the world. Shortly after her summoning, she was reunited with Byleth, being able to interact with them in person.

"So I guess you were a real person after all." Byleth said with a hint of dry sarcasm.

"Of course I am real!" Sothis said, feeling slightly offended. "What, did you think you were delusional all this time? Geez, sometimes I don't know if you're being serious or just messing with people."

"So what does it feel like having a body?" Byleth asked Sothis.

"That's hard for me to express." Sothis said in a mellow mood. "It is hard to explain for someone who has never lost theirs. Honestly, this whole thing feels like a dream. This form is temporary and once my duty here is done, I will vanish back into your mind."

"... So is there anything you want to do?" Byleth said, having nothing to say about Sothis' crisis.

"Oh, of course." Sothis said, snapping out of her deep thoughts. "Hmm, now that I have a body to work with, there is something you could do to me. You know, since I have been helping you all this time."

"And what could that be?" Byleth asked.

"Well, I've noticed that you really like to cook with your and other students." Sothis said. "That, and fishing, but that's besides the point. So I want you make something for me, if you don't mind."

"Like what?" Byleth asked.

"I don't really have any preference." Sothis said. "Just try to figure something out."

Byleth just shrugged. They were going to probably try to find something to do with Sothis anyway, so might as well be this. So the two of them went ahead to look for a kitchen.

Few hours later, Byleth had cooked a stew from the ingredient they found laying around. They also got a large pot to cook it in, with it having enough to cook for least an entire class of students. Byleth brought it to Sothis and started filling her bowl.

"Hope this will be enough for you. I only had ingredients that were laying around." Byleth said.

"No, it's fine." Sothis said. "I don't want to be a picky eater for my first meal."

With that Sothis started digging in into her stew. To Byleth's surprise, Sothis happened to be a fast eater. She wasn't messy or anything, it just wasn't exactly what they were expecting. In matter of minutes, Sothis was already done with the bowl while Byleth was hardly midway through theirs.

"Mmmm, that was delicious." Sothis said. "If I may, I'd like to eat more."

With that, Sothis went on and scooped up more stew to eat. Byleth was again surprised by her, as they thought that her petite stature would mean that they wouldn't eat too much. But instead, she ended up almost finishing the entire pot all on her own once the two of them were done eating. She would probably compete with Raphael in terms of how much she ate.

"Whew, I am stuffed!" Sothis said, patting her belly. "Sorry if you wanted to eat more. I couldn't help myself."

"I can tell." Byleth said, looking at Sothis' pot belly she has gotten.

"Hmm, you know, I really did enjoy your cooking." Sothis said. "So I want you to cook for me whenever you can."

"I guess I can do that." Byleth replied.

"Good. I wonder if there are any others who want to cook for me..." Sothis thought to herself.

Some time later...

"Byleth, are you done yet?" Sothis yelled.

"Just a moment." Byleth said back.

It has been a week since Sothis arrived in the castle, and already she has gotten the whole eating thing over her head. She wasn't simply satisfied on eating Byleth's cooking and has gotten multiple other Heroes to cook for her. And with so many Heroes around, this has accumulated into Sothis becoming a immobile blob of fat who can't do much than eat more.

"Are you sure this is something you should do?" Byleth asked, being bit concerned.

"Hey, no one has complained about it." Sothis said. "Besides, this is just a temporal body, so I'd rather enjoy my time as long as I can."

Byleth shrugged. As long as she's happy and no one's complaining, then it probably is fine. Though they are thinking that she is just using excuses to pig out...

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A story-illustration collab with  ToyoRai. Illustration by me. Story by Toyo with some grammatical changes by me.

Idea for fat Sothis was provided by  ElCid.

{on a side note, I know Sothis is supposed to be a deity and not actually human, but with these pointy ears, I wouldn't really call her a full-on human and she's definitely not considered an elf, so I'm just going to go with "Exotic (Other)" for the species for now}