The Fallen Angel - Underfell

Frisk's acceptance

Frisk, Sans and Papyrus were discussing about how they will convince the monsters to stop being hostile and bring peace to this world.

"Mettaton completely agrees with us, he said he always wished for peace." Papyrus said.
"Can't we make him turn his fans to our side?" Frisk asked.
"Fans? Mettaton doesn't has fans here, they think of him as an annoying stuck up star who has no talent at all."
"Yea the only fan he probably has is my brother here." Papyrus slapped the back of Sans' skull.
"What? You're practically the only one who looks up at him."
"Sans...you better shut your hole or I will punch your soul out of you."
"Geez okay okay. Sans said rubbing the spot Papyrus had punched him.
Although looking very pissed Frisk could notice a small blush on Papyrus' cheek bones.
"Okay...but why is he so popular then?"
"Well...Mettaton used to be a star when he first showed up. He hosted violent shows and is pretty much designed as a killing machine." Papyrus explained.
"But one day something happened which caused him to go soft and lost his menacing reputation. He still hosts shows but they are nothing compared to what he used to do."
"Do you know what happened?"
Papyrus shook his head.
"Although him and I are very close, he never told me what happened."
"I think the only one we really should be scared of is Undyne. She would never let us get away alive if she found out about you and our plans. But hey if my bro here changed then who wouldn't she?"
"Sans...I don't think you know Undyne that well...She would kill us without any hesitation and will turn Frisk in to our king. She only cares about revenge, she wouldn't die unless she has avenged every monster that got killed during the war."
"What about Alphys? Is she also that bad in this universe?" Frisk wondered.
"Alphys...is know for her cruel experiments...she's the one who made Mettaton but completely disowned him after he changed. Mettaton felt broken when she did. She called him one of the biggest failures she ever made and that she shouldn't have gave him a will for his own." Frisk could hear a sad undertone in Papyrus' voice.
"That's pretty harsh..."
"Indeed it is..."
"Can we stop talking about that robot please?"
"Sans don't you like Mettaton?"
"He's way to flamboyant...and I'm 100 percent sure he's gay."
Frisk bursted out laughing.
"Oh come on Sansy, don't be like that."
"I just don't trust him." Sans' eyes glided to Papyrus who was awfully quiet.

"Paps?"
"It's better if we continue this discussion tomorrow. I'm exhausted." Papyrus said faking a yawn very obviously.
Sans raised an eyebrow.
"Sure bro, goodnight I guess."
"Yes, goodnight Sans, goodnight Frisk."
Papyrus went to his room too quickly to be exhausted in Sans' opinion.
He followed Papyrus with narrow eyesockets.
"He's hiding something...don't you think?"
"Sans, give him a break he's old enough to make decisions on his own, just let him."
"It's just that I don't trust that robot. Who knows what he does when Paps visits him...."
Frisk kissed Sans so he could relax.
"I'm also going to sleep."
"Can I...join you?"
"What about Papyrus?"
"He gave me permission to sleep together."
"Oh...okay."
"Are you okay with it?"
"I guess I am."
"Good."
Sans followed Frisk to his room telling himself to calm down.
"Sans?"
"Yes Doll?"
"Can you stay out of the room until I'm done preparing?"
"Oh sure Doll, I don't mind."
Sans stood outside of his room for nearly 15 minutes.
"Sans...you can come in now."
When Sans entered his room Frisk was already laying  down his bed.
"Is it comfy enough?"
"The mattress is harder than in the inn but I can manage."
Frisk smiled at him.
"I'm sorry for keeping you in that inn for so long Doll."
"It's okay Sans, I don't blame you for anything."
Sans took of his sweater and his shoes and then made his way to his bed.
The closer be came the flustered he became. He had never shared his bed with someone. Let alone a girl.
When he lifted up the covers he saw something caught his attention.
Frisk only wore his jacket and her panties.
Sans turned red as a tomato when he saw this, perhaps even more.
He just stood there frozen gazing at the sight of Frisks body.
"Sans?"
Sans didn't seem to notice, in fact Frisk even thought she saw a glaze in his eyes which she hadn't seen before.
She then sat with her knees on the bed so she was on eye level with Sans.
When he noticed her eyes staring into his he snapped out of his thoughts.
"I'm sorry Doll....I was just thinking."
"Thinking about what?" He heard her innocent voice ask.
Sans gulped.
"Well..." he didn't dare to continue his sentence.
"Sans...I've been thinking."
"About what?"
"I....think I'm ready." Sans could notice she had difficulties with telling him.
"Doll...are you sure? You don't have to push yourself."
"I'm not pushing myself. I want to do this." She said more convincing.
Sans brushed his hand through her hair.
"Very well then."

Warning ! Mature content starts here.

Sans pressed his teeth against her lips holding his hand on the back of her head.
But just kissing her wasn't enough, he let his tongue slide over her lips. After a few times she opened her mouth granting access to Sans' tongue.
Their hands roamed over each others body. Sans let his hand glide over Frisks back resting it on her rear.
Frisk on the other hand slid her hand up Sans' shirt and touched his ribcage. Frisk felt a shiver down her spine when Sans squeezed her butt.
He broke the kiss and whispered in her ear.
"I really like that ass of yours.
"S-Sans...don't say that..."
Frisk felt really flustered which caused Sans to grin.
"You're so cute when you're like this."

As revenge Frisk traced Sans' spine which caused a surge through his body.
"Ah...Doll...that's too much." He moaned.
Hearing Sans moan made Frisk wanting to make him moan even more.
So she did it again but this time very slowly.
"Aah...oh....Do...Doll....what did I say?"
"I'm sorry Sansy....I just want to make you feel good."
Sans pushed Frisk down on the bed and zipped her jacket open.
He didn't spend time gazing at her bra but instead he grabbed at squeezed her breasts.
"Sans, you're a bit too rough." Frisk yelped.
"I'm sorry Doll, it's just too hard to control myself now..."
He loosed his grip and shoved his hands under her bra squeezing them.
Frisks moans sounded like music to Sans' ears.
Suddenly he stopped making Frisk wonder something happened.
"Sans? What's wrong?"
"Eh...how do you take this thing off?"
Frisk giggled and undid her bra for him.
"It's really not that hard." She winked at him.
"I'm sure we'll have time enough for me to learn it."
Frisk layed down on him while Sans started to gently nip in her nipples.
"Ah....Sansy...." Frisk moaned
The glow in Sans' pants became visible through his shorts which made it easier for Frisk to spot.
"Sans...I want to touch yours now."
"Are you sure?"
"Yes."
Sans went to sit on the bed and took of his shorts revealing his red cock.
Frisk carefully grabbed it which caused it to twitch.
"Don't worry, I think I know what to do." She smiled.
She slowly pumped up and down making Sans suck in his breath.
Following Sans' instructions and facial expressions she almost guided him to an orgasm.
"Stop, I don't want to cum yet." He ordered her.

"Now it's my turn again to make you moan.
He rubbed Frisk through her panties. She was already moist.
He took off her panties and kept rubbing. Everytime he touched her clitoris she flinched. "Does it hurt?" He asked her.
"No....it's just really sensitive." She explained. He tried to avoid that spot so it wouldn't be too much for her and traced his finger over her folds and opening. Then he pushed his finger inside her causing her to tense up a bit.
"Hon, relax it's me." He tried to relax her.
Frisk took deep breaths and relaxed. Then Sans added another finger and pushed them in and out.
"Sans, I want you inside of me now."
Frisks face was flushed with lust and was really certain about her decision.
Sans went to lie on top of her and kissed her forehead as he pushed his cock inside of her.
"Ah...Sans !" She yelped.
Never had Sans felt such a warm and soft thing around his cock. It was so overwhelming.
"Hon....are you alright?"
"Y-yea..."
"Does it hurt?"
"Not too much, just let me get used to it."
Frisk too had never experienced something like this. She felt as if she was getting stretched out. But in a good way.
"I'm okay now.
"Just tell me when I hurt you."
Frisk nodded.
Sans proceeded to thrust into her in a slow pace.
Soon they ended up as panting and moaning not caring if anyone could hear them.
Sans picked up the pace after hitting a certain spot inside of Frisk which drove her crazy.
"Sa....Sa....ns....don't stop....please..." she begged.
"Don't worry.....I won't."
"Ah.....Sansy......I'm....I'm going to cum..." Frisk yelled out as she reached her orgasm.
Her walls around Sans' cock clenched rhythmically.
Not so long after Sans came inside of Frisk releasing his cum inside her.
After coming down from his height he got off of Frisk and covered them back up with the blanket.
"Doll...thank you so much"
He said while hugging Frisk tight.
"I'm also very happy I did this." She admitted.
"Sans...I really love you so much."
"And I love you too Doll."
And they drifted to sleep.

To be continued...