Toriel

Frisk had fallen into the underground a few days ago and was now living with Toriel, who protected them and gave them a place to live. Toriel seemed clumsy to Frisk because she always seemed to accidentally do odd things to and around them. She would sometimes walk backwards and bump Frisk in the face with her butt, or fart towards them while cooking. She always apologized but it happened a lot and Frisk would sometimes ponder if she did it on purpose or not but assumed not because she seemed very nice and apologetic. One day Frisk was in the living room sitting on the chair and he heard Toriel enter the room. She grabbed a book and walked over to the chair before sitting right on Frisk's lap. She quickly apologized and stood up. What puzzled Frisk was how she seemed to rub her butt all the way up his body as she stood up. Frisk ignored it and soon dozed off.

Frisk awoke later and stood up, observing the living room. they walked into the main room and checked the bedrooms for Toriel before walking back to the living room. As they entered something purple under the chair caught their eye. The walked over and picked it up from under the chair. It was a pair of panties with a wet spot on the front. Frisk quickly dropped them and kicked them back under the chair. They walked to the kitchen to find Toriel cooking a pie. She had headphones on and was dancing around. She seemed to not notice Frisk and quickly did a butt thrust which knocked Frisk over. She gasped and turned around, standing over Frisk who was pretty much only able to see up her dress and they were able to see that Toriel was wearing nothing under the dress. She helped them up and apologized before sending Frisk to bed.

Frisk enjoyed living with Toriel aside from the awkward moments between them but soon began to feel homesick. They told Toriel how they wanted to go home and she was confused.

"What do you mean? this is your home."

Frisk told them that they wanted to go back to the surface and go back to their real home and Toriel again denied them.

"You wouldn't make it there, Asgore would kill you."

Frisk decided the only way out was to just leave then and there. They began to walk down the stairs towards the exit when Toriel stopped them.

"I told you you can't leave."

Frisk told them that they weren't going to stay there any longer and they at least wanted to try going home.

"I'm not letting my little ass toy leave me" She smirked and grabbed Frisk by the collar and carried them to her room and threw them onto the bed.

Toriel got on the bed and pinned Frisk to the bed with her ass. Frisk tried to talk but they were silenced when she sat down on their face.

"I always tried to hide it but I love you being under my ass where you belong~ I don't even need to worry about holding back and keeping the façade when you would leave anyway."

Toriel lifted her dress showing Frisk her massive ass which was slightly covered by a lavender thong which tightly hugged Toriel's curves. She looked back at Frisk and laughed.

"I called this house your home but this right here is your home forever~" She slapped her ass and farted on Frisk.

Toriel basked in the ecstacy of finally being able to dominate Frisk with her ass. She rubbed her ass up and down Frisk's face occasionally letting out a fart. She grinded hard on their face and let out a massive fart.

"This is some real monster magic huhu~" Toriel continued to torment Frisk and got more and more wet.

Toriel began to rub her crotch and again mocked Frisk.

"I've always loved toying with you and knocking you around with this ass, but it's so much more exciting knowing that you're all mine. Let's really get you in there hun."

Toriel slowly slipped her panties down and spread her ass cheeks showing Frisk her asshole.

"How about you give her a kiss~" Toriel winked her asshole at Frisk and farted again.

"actually no that's not good enough, how about you eat my ass like my pie!~" Toriel slammed her ass down onto Frisk's head and laughed.

The torture lasted for what felt like hours and soon Toriel was ready for bed. She thought about what to do with frisk and she got an amazing idea. She turned around and shoved Frisk into her wet crotch.

"Drink up Friskie"

Frisk began to feel nauseous and soon felt Toriel's weight seem to increase. Frisk realized they were shrinking under Toriel. She laughed as Frisk became smaller and smaller. Frisk stopped shrinking and looked up at Toriel. She was a towering giant and Frisk was small enough to fit in the palm of her hand. She picked them up and held them up to her face. She pushed Frisk into her lips and passionately kissed them.

uuurrp Toriel burped on Frisk, releasing them from the kiss.

She took Frisk to the living room and grabbed one of the small wooden chairs. She dropped Frisk onto the chair and took off her dress. Toriel was now only wearing her purple bra and She caressed her body while sexily looking down on Frisk. She turned around and showed off her ass and crouched over the chair. Her asshole was now massive to Frisk and they knew exactly what she was going to do soon. Toriel lowered herself onto Frisk and began to crush them under her sweaty asshole. She giggled at how much it tickled and how much have Frisk suffocating under her ass made her wet. She farted a few times and stood up. She grabbed frisk and stuck him between her cheeks so his head stuck out. She walked to the kitchen and grabbed a pie that had cooled off. She farted and walked over to the living room table, setting the pie down. She pulled Frisk out from her cheeks and stuck them in the pie. They were held completely still by the pie and stuck in a standing position. Toriel turned around and lined her asshole up with Frisk. She giggled to herself about what she was about to do.

"Have a good sleep Frisky, I know I will~ In you go!"

Toriel jumped into the air and came crashing down on the pie. Frisk was shoved into her ass and the smell was unbearable. Toriel laughed as she stood up and observed the smashed pie with two large indents around the mush. She spread her cheeks and touched Frisk's legs which hung from her asshole. She pushed Frisk in all the way and let her cheeks slap together. She dragged a finger along her ass and stuck it into her mouth, tasting the pie.

"Ooh, that's some of the best pie I've ever made. You know what they say, The best pie is homemade and mama's been cooking up some fat pie!~" Toriel slapped her cheeks and grabbed them hard.

She let out a massive fart and wiped her ass with a few of the plushies from the bedroom. She put her lavender panties back on and got into bed. She fingered herself and drifted to sleep, thinking about how much she can do with Frisk who was now all hers.
Toriel woke up to the small wiggles of Frisk inside her ass. A smile crept across her face as she felt the rhythmic pounding of small fists hitting her asshole, and she became very aroused. As she laid in bed she began to massage her ass and lightly poke at her asshole. Toriel thought about the day before and how she loved finally showing Frisk her true colors and sealing them away inside her ass. Toriel thought about her ass and Frisk struggling inside and as her pussy got wetter she decided to satisfy her new lust formed from the small captive in her bowels.

"Looks like you're up early, How about you help out momma with this urge"

Toriel reached her hand down, pulled her thong to the side and stuck a finger deep into her ass, pushing Frisk deeper inside. Frisk felt the soft fur from Toriel's finger ram into their face and slide then deep down into the abyss of her ass. The smell was terrible but Frisk had gotten somewhat used to it, their determination pushing them to escape no matter the circumstances. Frisk didn't sleep the night before, Toriel's bowels churned all night throwing them around and the slime coating the walls clogged their nose and mouth constantly. Frisk felt their body starting to weaken at the lack of sleep and constant assault from Toriel's ass. Toriel relished in the pleasure of her finger deep in her ass and the knowledge of Frisk fighting to stay alive in her ass, the thought that her butt could dominate someone to this extent... she needed more. She would hold that thought for later to focus on her pleasure. She wiggled the finger in her ass, reaching up to her knuckle, feeling Frisk's slimy form struggling in her ass.

Gggrrblblblrrr

Her stomach rumbled and she felt a familiar tightness in her bowels. She smirked and bit her lip as she pushed on her gut with her other hand.

Ppppfffrrrrtttt

The fart vibrated on her finger as it rumbled out of her big ass, coating it in her stench and adding to her immense lust. Toriel moaned and inhaled her fresh fart, feeling the wetness in her thong become even more prominent. She loved her own scent, and the thought of Frisk coughing and being surrounded by such a nasty stench created by her big butt gave her a massive turn on. She grabbed a cheek with her free hand and squeezed it, playing with her big fat ass.

"Bet you'd love some fresh air right now but sadly you won't have any of that again! The smell of my big ol' butt will be the only thing you know, and maybe if I torture you enough it'll brainwash you~ Ahahaha!"

Toriel slowly pulled her finger out of her ass and gave it a long sniff while her other hand pulled the front of her thong away and she started to massage her wet pussy. She stroked faster and faster as she thought of Frisk fighting inside her ass, then she thought of herself as a goddess who towered over the planet, her large furry ass looming over and letting out a fart on the small planet. She would tease and wiggle her ass at the terrified people on the planet. They would be able to get a faint whiff of Toriel's ass stench as she spread her large cheeks towards them. Her asshole would be like a blackhole, but the poor people would suffer a much more terrible fate than a blackhole. She would bend down and the small planet would tickle her backdoor, and she'd open up her waiting asshole and swallow it into her massive ass. The planet would be plunged into darkness and extreme heat, and the rancid smell her ass created would dominate the planet and melt the minds of the inhabitants.

"My asshole is your god~! You'll never see the light of day again and you'll live eternally inside my stinky ass~!"