It was a quiet day- er...night(?) underground. Minus the sounds of the lone monsters that roamed around. A familiar anthro fish female was roaming around Waterfall with a spear in hand. 

"Ugh...there's not much going on..." The fish guard grumbled, leaning against the wall boredly. Just then, her stomach gurgled as she placed a hand over it.

She sighed as she abandoned her post and searched around for a toilet to poop on. During her search, a small fart left her rump.

*Prrrrt~* 

She rubbed her stomach as the felt the need to poop started to increase a bit.

"C'mon...where's the toilet..." She mumbled to herself as she kept searching. Then, she finally found something! Except...it wasn't a toilet. It was a chamber pot!

She gave a toothy frown at the chamber pot. She didn't really want to poop in a chamber pot...

*PPPPFFFFTTTT!*

She frowned more and walked over to the chamber pot quickly, unbuckling her pants in the process. She manages to unbuckle her pants as she pulled them down, revealing her thong like panties. 

Once she was at the chamber pot, she pulled down her thong quickly and sat down. 

*BBBBBBBBPPPPTTT!*

A relieved sigh escaped from her mouth as a long snake slithered out of her anus and plopped into the chamber pot. A few other turds slithered out as well. 

"Ahhhhh yesssss!!~" She moaned out in relief.

*PPPPPRRRFFFTTTTT CRACKLE PLOP SPPPPSSSSTTT FRAPPPPTTTT*

More relieved sighs came out as more turds slithered and splatted into the pot. Then she lets out one last log and fart to finish it off.

*BBBBBBBRRRRAAAPPPPTTTTT SPLAT*

She closed her eyes and smiled. She then got up from the pot and went over to a nearby lake and dunked her buttcheeks in it. Once she washed her buttcheeks, she pulled her panties and pants up then went over to the chamber pot.

She picked it up and went back over to the lake. She dumped all of the waste into the lake and went back over to the spot where the pot sat and placed it back down. Undyne then grabbed her spear and went back to her post.

The End.