UNDERTALE: Sans x Frisk One-Shots!

Bored

I saw this comic by a Tumblr user named Wakyky15 and I couldn't resist writing this. XD
I have zero regrets. XD

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When it comes to having a skeleton as a boyfriend, there are some things that you really can't expect from him. That's what Frisk had always thought ever since Sans became her boyfriend.

For one thing, she was thinking that Sans would still treat her like a kid similar to how he always did back in the Underground. Though she was, and still is, a teenager, he would always treat her like a child. She didn't mind it though, and she anticipated it from him.

Oh but was she so wrong. As soon as he declared them boyfriend and girlfriend in front of everyone (with Alphys screaming that her ship had sailed over and over again), Sans had treated Frisk like anyone but a child. In fact, he was even more delicate with her, making sure that she was feeling comfortable and happy as long as he was around. To the human girl, it felt so different than when he pulled pranks on her in the Underground. It was as if he had changed into a very refined and sweet gentleman.

And that's not the only thing that Sans surprised her with. From the start, Frisk always thought Sans was just a lazy 'bag of bones' who would care less about anything other than Papyrus and the people he cared about. Heck, he hadn't even picked up his sock in his house.

Though she soon found out something else; he was super possessive. As soon as the monsters reached the surface, there were some people who wanted to talk to the monster ambassador in and outside of school. And it wasn't to ask for help in homework. As you may expect from the possessive skeleton Sans had become, he would immediately teleport behind Frisk and threaten anyone who tried to take her away. It was clear and evident that he was not taking any chance of letting Frisk fall for anyone else.

So much for a lazy bag of bones. Then again, there were some days when this new, clingy side of Sans appealed to his beloved girlfriend.

And this was one of them.

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"Hmmmmmmmmmmmm..."

The small pinprick eyes in his eye sockets darted around the room, desperate to find something to do. Ever since the monsters came to the surface, this was something that Sans would do a lot. Most of the time, his older brother Papyrus would be out with Mettaton (Sans somewhat approves their relationship, about 50%). Undyne and Alphys would be out dating as well. Toriel was working at her childcare school for human and monster children and Asgore would be caring for the school's garden. Almost every monster had something to do every day.

All except Sans. Like now, only he and the human girl were seated on the couch in the skeleton brothers' house. There was no one else at home, and an eerie silence occupied its halls. Frisk was leaning on his shoulder as her eyes remained glued to the words in her novel. On the other hand, Sans had nothing to do.

When his eyes found nothing to do for the tenth time, Sans heaved a sigh of frustration and tilting his skull, resting it on Frisk's head. "I'm bored..." He muttered as he closed his eyes.

The human girl beside him closed her book for a second as she patiently replied: "Then do something."

"Like what?" Judging by his tone, Sans had only gotten even more bored.

Frisk shrugged. "Anything, just don't go to Grillby's. I don't want you getting drunk again." She shook her head, sounding annoyed.

"I won't get drunk again, I promise." Sans turned to Frisk and frowned. "And besides, you haven't looked at me once all day..." There was a hint of sadness in his voice.

Unfortunately, Frisk was not fazed at all. "Not yet," She declared before adding. "I need to finish reading this for a book report, and I'm almost done so I can't stop now." And she went back to her reading.

Sans puffed. She is so determined, He thought. There was nothing that could shake her resolve as soon as she decided on something. But then again, that was something that he admired about her.

And at the same time, as determined as Frisk was, Sans knew that there was something that she could never resist.

As sneaky and silent as a snake, Sans smirked deviously and lowered his head to the same level of Frisk's shoulder. He shifted himself closer to the human girl while she was too engrossed to notice his movements. As he leaned his head closer to Frisk, his two hands planted themselves onto the sofa, supporting himself as he continued his approach, his head near her neck.

And just when Frisk realised that the cushions on the couch had shifted, the blue tongue in Sans' mouth appeared and slowly licked Frisk's nape.

Immediately, the book fell out of the girl's hands and her face turned into a shade of scarlet. A shock wave went through her whole being and she hitched a gasp as the sensation of Sans' wet tongue stayed on her neck. In a tender and skillful manner, Sans continued to lick Frisk's neck, his saliva drawing lines all over her nape. It made Frisk bite her lower lip gently as her face blushed to the shade of a tomato. She made no attempt to stop Sans as she succumbed to the sensitive sensation on her skin.

Seeing that Frisk wasn't stopping him, Sans reached out his hands and grabbed her arms, deepening his licks on her neck. They soon escalated to small nibbles and then, out of nowhere, he bit the side of her neck, making her yelp and moan.

Sans chuckled. "Sorry, I think that bite was a 'bit' too hard for the first time." His voice in her ears suddenly sounded addictive and Frisk could not ignore it. "Don't worry though, sweetheart," He slurred. "I'll be more gentle now."

She didn't know what to expect. That lick on her neck made her freeze on the spot and she couldn't move a muscle.

And then, she felt something on her head. Then another. And another. Unlike the wet feeling she had on her neck, these were shorter and only lasted for a few seconds.

She soon realised what was happening when Sans suddenly buried his head into her hair, breathing in the scent of her hair that was bathed in strawberry-flavoured shampoo. Not only was it adorable, but it was also ticklish. Frisk could not stop herself from giggling. "S-stop...!" She managed to say in her laughter.

The skeleton made no effort in stopping as he laced his arms around his girlfriend's waist and pulled her closer to him. Oh how he loved her laugh. To anyone, it was just a laugh from a normal girl. But to him, it was the beautiful laugh that came from an angel.

After a few seconds of listening to her giggles, Sans decided to stop nuzzling her hair and instead rested his head on Frisk's shoulder. "I think I've found something to do," He remarked.

"Oh?" Frisk smiled, still giddy from Sans' tickling. "What is that?"

The skeleton nodded. "I'm gonna take a nap with my sweetheart girlfriend." He gazed up at her. "Will you join me?"

"Not like I have a choice, do I." She chuckled, gesturing to Sans' bony arms around her waist.

"No, you don't." Sans had a sly look on his face as he teleported the both of them to his bedroom.

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As to what happened after that, go ahead and imagine. ;D