Author note: Reminder for those who may be triggered by this chapter.

Firstly, yes, there is sin. Buuut it's not like dirty sin, I wanted the moment to be more about the characters caring so deeply for one another, rather than it just seeming like pointless smut.

Second, both characters are both over the age of 18 in this story making their relationship completely legal.

I've never actually properly written something like this before in a fanfiction, so excuse me if it's cringe-y. ^^;

Just wanted to point these things out so people don't go and complain later.

****

When they got inside the house, Frisk closed the door behind them and frowned at Sans, letting go of his hand as she crossed her arms. 

"Sans, you can't keep doing this." She told him, now no longer being able to blink back the tears that she had been trying to hold back at Toriel's. How upset she was was clear in her voice, and her vision was beginning to become blurred by the fact that said tears were starting to form within her eyes.

"doing what? trying to protect you?" Sans frowned as he stared back at her. "i don't want you to get hurt!"

"I understand that, Sans. I really do. I don't want you to get hurt either." She admitted sadly, taking a step towards him. "But can't you respect me enough to allow me to make my own decision? I know that this is risky, and I know that if anyone found out we could get into trouble but... I'm willing to take the risk. You know the others would make sure that no one would find out about us, that they'd defend us both... I don't want to be with anyone else, Sans." She said, taking another step towards him. "I want to be with you." 

"it doesn't matter, frisk! no matter fucking what, we just... we can't be together anymore." Sans muttered, staring down glumly at the floor. "it's... it's not allowed... because of that fucking asshole... we're not supposed to be together. it doesn't matter how much i love you, or how much you love me, we just... we can't..." He trailed off, tears beginning to stain his cheekbones as he just didn't know what to say, or even how to react. All he wanted to do was hold Frisk close and kiss her, show her how much she meant to him. But the strange sense of paranoia, the idea that someone could find out that they were still sneaking around together, that they could be found out, it was stopping him from doing just that. He wasn't even supposed to be here. 

However, despite all the sobbing from the both of them, Frisk slowly walked up to him and placed her hands on his cheekbones, just staring into his eyes. Until she leaned forward and softly kissed him. He stilled, not knowing what to do, whether or not he should kiss her back, whether he should react at all. But when she began to pull away, Sans couldn't help but stop her, as he wrapped his arms right around her and held her body close to his. It didn't matter how much he tried to push her away because of how things were now, he loved her to, to much to be able to say no. He couldn't go and live his life without her. He needed her. More than ever. And that fact was clear as the kiss deepened between the both of them. 

As the kissing continued, the two slowly made their way to the bedroom, not even keeping their hands off each other for a second as they stood in each other's arms. In Sans' arms, is truly where Frisk felt the safest. She knew she could trust and count on him, no matter what happened. And no stupid rule was going to stop her from being with the one she loved. She hoped Sans agreed with her, as they both went to sit down on the edge of the bed, tongues still colliding all the while. 

Pulling away for breath, Sans looked half dazed as he panted, staring back at her with a light shade of blue highlighting his cheekbones. Frisk quietly giggled in return, red blush only going to cloud over her own cheeks. "You look so handsome." She whispered, placing a hand on his cheekbone. He softly smiled at her in return, putting his hand on top of hers as his eyes could never leave her face. 

"i love you... god, i love you so, so much..." He whispered as he looked like he was going to cry again. "which is why i just hate the way things are now... the fact that we're not even allowed to be together. we're not even allowed to have a future together... all because of him." He murmured glumly and Frisk frowned. 

"Look, Sans, whatever happens, we'll find a way to fix this. I'm not letting him keep us apart. I'm not allowing for him to keep humans and monsters segregated like this. It's my job as ambassador to ensure you guys still have your own rights. And no matter what, I am staying by your side." She said.

"i... i want nothin' more than to stay by your side too. i don't want to let things get in the way." He sighed, causing Frisk to smile at him as she slowly moved in for another kiss.

"Well, then let's not let him spoil what we have." She spoke in a hushed whisper, pressing her lips up against his mouth once more, as her hands moved up towards his shoulders to remove the hoodie from around his skeletal torso. Frisk smiled into the kiss as Sans gladly allowed for her to take it off of him, once again just throwing it to the side as they stared at each other, almost as if they were trying to remember the other person's facial features all over again. 

"Nothing can stop my feelings for you, Sans. Nothing." 

"nothing could ever stop me loving you either." Sans replied quietly, going in for another kiss, before feeling like Frisk was beginning to push him down to lie down upon the bed. He slipped his slippers off of his bone-y feet and led upon his back, as Frisk happily climbed atop him and giggled. The skeleton beamed up at her, closing his eyes when his mouth and tongue went to meet hers. Frisk then began to move towards his spine once again, causing him to blush from embarrassment once more as quiet grunts and groans were let out from his mouth from each nibble. 

He began to blush furiously once Frisk's hands wondered and found their way underneath Sans' plain white shirt, beginning to tease upon his ribs. With the sensation of her kissing at his spine, and her fingers wondering his rib cage, it was no surprise that he began to slightly wriggle beneath her, and his groans became a little louder and more frequent, but he tried to keep himself quiet as he was worried about anyone hearing him in the house next door if he became too loud. 

"Why don't we try to get this shirt off?" Frisk teased, Sans chuckled in response, smiling up at her. 

"hey, what about you?" He questioned with a small smirk and an eyebrow raised. "i can't be the only bare one here." 

"Well, of course." Frisk replied. "All you had to do was ask." She teased, whispering beside his skull which got a small shiver out of him in response. Smiling all the while, Sans sat up, taking off his shirt with the help of Frisk, before proceeding to remove her sweater from around her body, leaving her top half exposed to him, the only item of clothing being on that half of her body was her bra. 

Being exposed like this to him only made Frisk's cheeks burn a brighter shade of red, but she wasn't ashamed to show him her body. After all, he was still her boyfriend, no matter what anyone else said. If they were going to have to sneak around in secret until things were fixed, then so be it. Sans was the only one she truly loved more than anything, and nothing could ever stop that. 

"you look gorgeous." Sans beamed. Frisk laughed in response as she bit down on her bottom lip from a small sense of awkwardness. But she knew that Sans wasn't judging her. That no matter what, he still cared about her, he still loved her. Just like how she felt for him. 

"You look amazing too." She teased, going to trace her fingers across his ribs once again, which got yet another soft groan from him in response. She was amazed by how smooth and pristine they were. They were perfect. And the fact that Sans was letting her be the person to do this to him, to get these reactions from him, to be able to show her passion to him, she felt like the luckiest person in the world. 

"They're perfect." She whispered, looming over the skeleton to begin kissing at his collarbone once again, which only made him gasp and allow for more adorable sounds to escape from his mouth. Clearly he was already beginning to enjoy it.

"i love you, frisk..." Sans murmured, staring towards her with clear affection within his eyesockets. Frisk beamed and moved back up towards his mouth to give him yet another kiss, before she replied to him.

"I love you too, Sans. So much. I promise you I love you more than anyone or anything. And I know I can't live without you." She said, going to lead her fingers upon his ribs once more, watching for the cute reactions on his face, even as she began to tease her hand lower and lower, eventually ending at his pelvis, teasing him around the bone which only caused him to grunt and groan louder as a result. Frisk's heart swelled up with pride and adoration, happy to be able to please him like this. "I couldn't live without you..." She repeated.

"i couldn't live w-without you either." Sans answered, weakly whining into her mouth as she pressed hers against his, continuing to run her fingers along his pelvis all the while. While Frisk was busy looming over him like this, Sans decided to move his fingers towards her upper back, locating the strap of her bra. Frisk gasped, her blush deepening as she stared down at him with her bright pools of green, into his two black sockets with the little white dots staring back at her. 

"Aren't you bold?" She joked while Sans sheepishly chuckled. Though, his laughter stopped when she went to lean down beside his skull again, going to whisper to him once more. "It's fine. You can go ahead." She whispered, sending a shudder down his spine. The skeleton tried his best to fiddle with it, whilst she was going back to pressing her lips up against his jaw, his spine... With her doing that, he found it pretty hard to concentrate, but he didn't exactly have the desire to ask her to stop. He adored how she made him feel. 

Eventually, with enough effort and concentration, Sans had finally managed to remove that one item of clothing off her, pausing momentarily to just admire her beauty. Seeing him staring, Frisk couldn't help but glance away from shyness. He just chuckled and placed his hand on her cheek, making her look back to his calm face. Honestly, he believed she was heavenly, every little thing about her. Even if she had her own little flaws, they never bothered Sans, they could never stop him from falling so hard for her. 

"you're like an angel." Sans smiled, gently pulling her face back to his as he closed his eye sockets and followed his blue tongue along her teeth and gums, just re-exploring everything, almost as if he was re-claiming everything as his once more. Frisk returned the kiss with vigour, until it was cut short by a deep moan from Sans and he lightly involuntarily bucked into her touch, as Frisk had gone and continued to allow her hand to wonder beneath his shorts, definitely feeling against something that gave him the turn on as he panted for breath.

"Oh? I'm guessing you liked that." Frisk muttered with her lips pulled into a wide smile, still getting filled with fulfilment from his reactions. Groaning, Sans nodded until he could find the voice to answer her. 

"please, frisk..." Sans shivered, closing his eyes as he gave her a desperate look. Frisk found it hard to deny anything to that face. 

"What is it, Sans? You can tell me."

"i... i need you, frisk. please." He breathlessly answered, opening his eyes to view her once more. She nodded, giving him a final kiss before giving him the permission. 

"Then you can have me." She answered. "You can have me, Sans." 

And with that said, the two decided to gently swap positions, continuing their own little make-out session for a short while, until they decided it was about time to completely undress. With every touch, Sans was as delicate as he could possibly be, almost as if one uncalculated touch could cause harm to her, and it made her beam with praise towards this skeleton, as she loved how caring he was towards her. 

Both being completely bare from head to toe, the couple clearly felt safe within one another's close embrace. Sans even jumped at the opportunity to be able to get a few nibbles in on Frisk's bare neck, and the sweet sounds she made really sent Sans over the moon, as he was just blowing up with love all over again for this adorable girl who he was so lucky to have. He couldn't help but smile, hearing her cutely whine his name a couple of times, before he moved back to those perfect lips of hers and gave them a soft, affectionate kiss.

Course, one thing had to be taken care of before they would go any further with this situation. The last thing either of them needed right now was something like an accidental pregnancy thrown on their shoulders. So, with the protection out of the way, they were finally able to go forward.

Sans wanted to make sure to be extremely careful as to not hurt her. "tell me if i hurt you, 'k?" He told her, and she reassured him, telling him that she would. Knowing that they were both on the same page, that's when Sans went on, and he went on to enter her at a fairly slow pace, not wanting to cause the slightest bit of harm to her. If she needed him to, he would stop, until he was told he was allowed to move again. 

When he was completely in, he gave Frisk a minute, allowing her to readjust to the sudden change. "it's okay, frisk. take all the time you need." He told her, which only made her smile in return. 

"It's fine." She answered. "You can move."

Smiling, Sans gave Frisk an affectionate kiss, before he began to move, and it was now that the two moaned and groaned in unison with one another, feeding off of each others reactions of pleasure as they shared this special moment together. Frisk gladly went to put her arms around the back of Sans' spine, just holding him close as she moaned out with him, only going to spur him on further.

Whatever other people thought, they did not care. Whether people believed it was disgusting for monsters and humans to be together, the pair could honestly not care. All that mattered to either of them was each other. And through all their pants and grunts, clearly they tried to convey that to each other, with the occasional "I love you's" to the "I love you too's". 

Whatever happened, Frisk was going to get this whole "separating monsters and humans from each other" problem fixed. She found it absolutely ridiculous that people thought they weren't allowed to love each other, that they weren't allowed to be with one another. They were just like them, living with thoughts and feelings. Just because they had magic and different appearances to them, it didn't give anyone the right to mistreat them. Just like how humans shouldn't mistreat other humans for where they come from, or what they look like. 

Though, of course in this situation, the moment had to come to an end eventually, as enjoyable, tender and attentive as it could be, they could only last for so long, just being whining messes when it was over, saying each other's names repetitively, until they were just silently lying in one another's arms just trying to catch their breath, with Sans resting his skull on Frisk's chest, under her chin. Beaming, she pecked him on the skull. "I love you... Thank you for this." Frisk whispered for the hundredth time. Sans softly chuckled in return, going to give her a soft kiss, until he led his head back on her chest again and closed his eyes to relax.

"i love you too... and thank you for this as well... it meant a lot." 

"Yeah..." She yawned, feeling just as exhausted as he was. "Anyway, I suppose we better try and get some rest now. I'm tired."

"heh. i agree." He said, going to reach to properly pull the duvet over their bodies as they snuggled close with one another. "rest well."

"You too, Sans." She whispered. "Sweet dreams."