Author Note: That awkward moment when this might just be the longest part in this story so far. xD

But anyway, I think many of you can already guess what's gonna happen in this part, if you've read the previous part. So if you think this part might trigger you, then I wouldn't suggest reading it. I'm not very used to writing this kind of stuff, so I apologise if it's pretty cringe worthy.

Just wanted to say that. But anyways, enjoy this part! 

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The change in atmosphere was something that was definitely felt between Sans and Frisk when they were still continuing to very slowly kiss, just making the most of the moment that they were spending together. It was very strange to think that something like this was actually happening right now, causing the couple to blush insanely. And having a heart, Frisk found it beating rapidly in her chest from both excitement and nerves. She had no idea what to expect from this whole experience, but she knew she trusted Sans. She trusted Sans with her life, which was likely quite clear by now. 

Seeing as Sans had decided to lightly pull Frisk onto his lap, so she was sitting facing him, he was gently running his boney fingers up and down Frisk's back, grazing over the material of the dress she was wearing, but also he knew that she would be able to feel his fingers wandering through her dress. Considering they were both extremely shy about this, they were going extremely slow, clearly just trying to build up to what could possibly happen. 

As if they were smooth, elegant, graceful dancers, their tongues glided with one another, neither of them really being more dominant than the other, as they were both equally anxious. But that was fine. They'd probably get more confidence the further they got through it anyway. And there was no way Frisk felt like she could be confident on her very first time. Neither did she expect Sans to be confident either, even if he had done it before. She didn't mind at all. Slow and gentle was nice.

"i love ya, frisk." Sans quietly whispered, panting a little when the both of them had to pull away from the kiss to get back their oxygen; their faces were barely inches apart. Softly blushing, Frisk smiled back at him, giving him another quick peck until she responded, telling him that she loved him too. So much. Seeing him like this, it was so cute and adorable. Remembering back to the days before they were going out, it made her wonder if she'd ever get the chance to see what Sans would be like in a relationship. He could just be the cutest skeleton ever. That statement was made even more true when he smiled sweetly at the fact that she told him she loved him, and he slowly leaned towards her once more.

Except this time instead of kissing her mouth, he kissed her on the cheek, then on her jaw, just wanting to show her so much love as he continued holding her close. Moving towards her chin, it was hard not to grin when Frisk actually went to lean her head back a tiny bit, giving him more access to the underside of her chin and jaw which he gave a tender kiss. Taking the quiet sounds she made from just that as his invitation to continue, he stayed giving light kisses to her skin around her jaw and neck. "That feels really nice." Frisk muttered, causing Sans to let out a tiny chuckle. 

"i'm glad. that is the idea after all." He murmured beside her ear in return. "you're really sure ya wanna go through this though, frisk? because you're allowed to back out if you're uneasy. i know this is nerve wrackin' for me, but i know it might be worse for ya, as this is your first time." He said. There it was, Sans being kind and understanding again. How could one man be so sweet without even seeming to try? Everyone around them might have got to see the more rough, intimidating side to him; she got to see the blushing teddy bear that rested on the inside. 

"I'm sure, Sans. I know I am. I want it to be you." She answered. "And I know you'll be careful with me." Frisk continued, feeling Sans place a few more pecks at the front of her neck, likely just from her reply alone. This monster made her feel so, so adored. Something that she hadn't felt in so long before meeting him and all their friends. Something she hadn't felt before they had fallen in love. 

"if ya change your mind, tell me, 'k? don't pretend to be comfortable when ya are not." He said, and when she answered, telling him she would do just that, he was glad that she would say if she couldn't go through with it. He didn't want to push her past what she was okay with. And he hadn't done something like this in such a long, long time. So, he wasn't even sure he would be good at it. But even if he wasn't, he just hoped that they were able to enjoy their time together. 

Kissing his girlfriend once more, he pulled one of his hands away from her back, going to place it on her revealed thigh from where her dress had a small slit in it, and it wasn't exactly covering up one of her legs as she was sitting on his lap. It did earn a small surprised sound out of her which did make him pause. However, he didn't exactly get a negative reaction out of her, and because of that he very carefully caressed her skin, earning more little noises out of her. Man, she sounded so magnificent already. Frisk found it awkward to be making such sounds; Sans didn't seem like he was complaining. 

Gladly moving his mouth back towards Frisk's ear, he decided to murmur: "do ya wanna go to my room?", while then proceeding to feel his own blush deepen when he heard her breathe a "Yes". That being said, he pecked her on the lips, while then beginning to stand up with his hands placed onto her back to hold her. Seeing he was going to get up from the couch, Frisk decided to wrap her legs around his waist, which Sans found it hard not to snicker at. It was a pretty bold move on her part; it at least helped him carry her to his room, where he went to kick the door closed with his foot, just like the first time this had almost happened between them. Except this time it was for likely definite.

Steadily putting Frisk down onto the covers of his bed, the skeleton smiled down at the girl whose cheeks were bright, bright red. But her small smile towards him showed him she was happy to be here with him like this. It was a whole new step in their relationship that she was willing to take. That she wanted to take. She wanted to become Sans'. That was something she knew for sure, as the skeleton towered over her to kiss her once again. "ya look so cute, frisk." Sans spoke with a murmur, nibbling at the side of her neck. Delicately gasping, Frisk went to reply. 

"Y-You look a-ah. Handsome, Sans..." Frisk gasped out, while the skeleton got a brief shiver from her from nipping at a sensitive spot on her neck. Seeing as her boyfriend had calmly chuckled, she could tell her reactions were likely impressing him; not just that, that he liked her kind compliment towards him. Landing her eyes upon Sans', she could tell he wanted to ask her something, and she gave him a look that told him to go ahead and ask.

"can i... um... y'know..." He nervously pointed at her black dress. "take this off?" Frisk couldn't answer such a question too enthusiastically, seeing as she wasn't used to the idea of someone else seeing her almost naked. She'd still be in her undergarments like her bra and underwear, but for how long? Not that she hated the idea of Sans seeing her completely bare. It was just the nerves trying to tell her to hide. However, she didn't want to hide. She wanted to continue forward. She wanted to experience the best night of her life with the one she loved.

"Y-Yeah... Go ahead." She gulped. Sans could tell she was shy. Hell, he was feeling the anxiety himself. If he was going too quick for her, he was happy to step back. He really hoped she wasn't just telling him to go on when she really wasn't okay with it. Because he was not okay with that. And he wanted to make that clear.

"are ya sure? i mean it, frisk. tell me if somethin' is too quick." Sans told her, only for Frisk to grab his tie and pull him even closer, so their faces were near each other once again. The monster had truthfully lost count of how many times he found himself in this position where their faces were this close. 

"I will, Sans. I will, I promise. But I want you to continue." She told him firmly, making sure he knew for a fact what she really wanted, and that she would say the word if something was too much for her. What she did appreciate though was that he was  obviously looking out for her, wanting to make sure she was comfortable. Showing just how much he cared about her, and that meant so, so much to Frisk. 

"okay, okay. someone's eager." He joked, making her feel embarrassed at such a comment, but then when Sans kissed her, she could only close her eyes and kiss him back, focusing on what their mouths were doing, rather than the fact that she could feel Sans going to remove the dress that rested snugly around her body. He was pulling it down further and further, exposing her body and more skin to him in the process. If there was one thing she hated about her body, it was the fact that she had some scars here and there around her stomach. It didn't help at all when Sans' pupils began staring over these scars once he had removed her dress. He must have noticed she suddenly seemed more nervous again, as he placed a hand to her cheek as if to reassure her. 

"it's okay. god, ya look more gorgeous than i could have possibly imagined." He teased, pecking her on the lips. Groaning into the kiss from humiliation, Frisk waited until Sans stopped kissing her so she could answer him. Why did he have to keep complimenting her like she was so, so perfect. Sometimes she felt like he was over exaggerating. 

"You're so lying right now." Frisk answered back with a tiny laugh, only for the skeleton to shake his head in denial, not taking her reply into a count. He didn't agree with that at all; he wasn't lying. He was being one hundred percent truthful. Without a doubt. She was like a perfect princess. Even if she might not have believed that herself, he believed it. "S-Sans. Can I u-undress you too? It'll m-make me feel less anxious." 

How could he say no to that? True, he was scared that maybe Frisk wouldn't like what she saw and she would perhaps change her mind. But if it was something that made her feel more comfortable in his presence like this, then he wanted to let her remove his clothing. He knew he'd have to take his suit off at some point. So why not now? 

Nodding, Sans could only feel his blush deepen when he kissed Frisk, and he could feel her hands beginning to fuss with his tie, which she then pulled off. Then she undid the buttons on his blazer, just so she could start pulling off the material over his shoulders, which he tried his best to help her with. For a moment, they broke apart from the kiss, smiling and giggling quietly with each other, before entwining their mouths once more and Frisk went on to unbutton Sans' plain white shirt. 

She took it off of his skeletal body with a beaming smile, finding him so adorable right now, as the look on his face made him look so unbelievably shy at the fact she was staring over his ribs. He too seemed to have a few scars and even some dents in his ribs, likely from missions he had been on, being part of the Mafia and all. And seeing as he had scars like she did, it made her feel less self conscious, and less alone. "Wow... Amazing." Frisk slowly reached up to touch one of his ribs, but then hesitated. "Can I touch?" When he nodded, she found it impossible not to smile, because he also trusted her enough to let her do this.

With her fingers, she grazed them against Sans' ribs, earning a deep but soft moan out of him. How embarrassing. Though even if it was embarrassing for him, she seemed to like the sound he made, evident by the bright look on her face. "Sensitive bones, huh?" She giggled, repeating the same movement along his ribs, therefore getting the same noise coming from his mouth. He could tell she was enjoying this. 

"s-shut up..." Sans stuttered. Though he didn't really mean that, he just said it because of Frisk's flirty comments towards him. Admittedly, they were getting to him, that was probably obvious. But he could get to her too. It's not like he had to be the only one groaning like this. With that thought in mind he lightly touched his hands to her stomach, hearing her hitch her breath. No words telling him to stop though. So he began to feel against her skin around her torso, getting small shivers in return.

For awhile, the two kept at this - feeling and touching each other around the upper body, as if they were allowing their fingers to get used to every curve and every bone. Both of them managed to earn a gasp and a moan from each other from just this alone, and it was honestly amazing. It made Frisk so full of joy to be here with Sans like this, with how affectionate he was towards her. She wouldn't have wanted this with anyone else.

Eventually, the skeleton asked for permission to be allowed to remove the rest of Frisk's clothing from her body, only for her to accept. She knew she was ready for him to go further. Though, there was something she remembered. They were going to have to use protection, otherwise Frisk would end up pregnant. And that definitely was not something she was ready or prepared for. It wasn't really like Toriel had said that down the phone just to embarrass her. It had been embarrassing enough when Frisk had put her hands in her coat pockets at some point, only to discover that her mother had put at least two condoms in one of them. Almost as if she anticipated this date would lead to this. Her mother just wanted to be protective, which wasn't very surprising. 

"S-Sans!" Frisk whined to her boyfriend, when she found him going to lightly squeeze one of her breasts, which Sans had to comment on that it was "so soft". Not just that but he groaned at the sound she made, while going to kiss at her neck once again, saying how "irresistible" she sounded. "W-Wait, I need to say s-something." She panted out, feeling tinges of pleasure from Sans' hands caressing her body. When he heard her say that though, he stopped doing what he was doing, allowing her to have the breath to properly speak. Which she was grateful for. "My coat... It's, um... In one of the pockets, there should be a... c-condom in t-there." She stuttered at her words. Before Sans thought she became prepared or something, like she had planned this, she added exactly what she had been thinking - that her mother had gave them to her as just a precaution. 

"oh, right..." Sans chuckled. "okay, i'll go get one of 'em." He told her, quickly giving her a kiss before going to climb off of her, so he could go grab the protection that was needed. It was still so hard to believe that this was actually happening between them, even though they had already been at this for a couple of minutes. After having left the room, it didn't take long for Sans to return with exactly what he had left the room for. They were more prepared now. "may we continue?" He teased, while Frisk laughed and nodded, allowing to climb atop her once more, so he could continue with his actions.

Nothing was more humiliating to Frisk than hearing herself moan quietly due to Sans messing with her exposed chest. She didn't even know it was possible for her to make such sounds, yet here she was, learning more things about herself she didn't even know thanks to this skeleton. Gently placing her hands on the back of Sans' skull, she just wanted to hold him close while continuing to whine and push her chest out towards him slightly now and then just to feel more with his tongue teasing along one of her breasts.

Truthfully, she felt like she had felt enough with Sans just touching and kissing her all around her body. She wanted to feel more, and she knew she was ready to. Whether he was ready or not to make the move was the question. But she'd see once she asked. If he wasn't ready, she could be patient for him to catch up with her. "S-S-Sans. Mmmm. I'm ready, Sans. I w-want to feel more." She told him, knowing he'd understand what she meant. 

"really? a-are ya sure?" He replied, staring down at her seriously, just wanting to make sure. He saw her nod, confirming that fact. He could only smile softly at that. "heh... well... if you're sure, i'm ready too... just... d-don't expect me to be great. that's all i'm sayin'." He murmured, putting his mouth to hers. That was until he leaned back, looking down at Frisk's underwear around her waist and he without a doubt felt his face grow hotter, as did Frisk's, knowing she'd be completely exposed to him. 

Knowing she was ready, he grabbed a hold of them and very slowly began pulling them down, causing Frisk to be bare from head to toe. She found it impossible not to cover her face with her hands, feeling so, so embarrassed that Sans could see all of her now. Her body wasn't just a secret that was kept to herself now. But now her significant other had seen her, which was something she didn't regret. Going to carefully grab her wrists, Sans moved Frisk's hands out of the way of her face and beamed at her. 

"don't worry... ya look amazin'." He reassured her, before giving her the permission to remove his suit pants if she wanted to. Being allowed to do that, Frisk accepted, going to grab the waist of Sans' pants only to begin removing them and putting them to the side afterwards, causing them to both be completely bare together. This made their eyes gloss over each other, as they were getting used to seeing each other completely naked for the first time. It was a new experience. An exhilarating one. One that Frisk would never forget. 

"so... are ya... ready for me to...?" He whispered tenderly, making sure for the last time that she was definitely sure. If she wanted to stop during though, that was also an option. He just really wanted to give her the chance to know whether or not she wanted to back out before they were about to do what they were about to do. But she was certain.

"Yes... Make me yours, Sans." She replied, only to make the skeleton give her a look that told her he was so in love. Especially with her saying something like that. He would gladly make her his if that's what she truly wanted. And he wanted to become hers. With that said, he proceeded to put on the protection, knowing they really wanted to avoid some kind of accident. Frisk getting pregnant and them having to look after a child was so something they were not ready for yet. 

"okay, here i go, hold onto me if ya need to, okay? and tell me to stop if it hurts." He muttered, while she replied with a nod. She did decide to wrap her arms around the back of his neck just in case, and it definitely had been a good idea. She couldn't help but cling to the skeleton a little when she felt him entering her for the first time. Moaning softly, Frisk felt the foreign feeling of him inching further and further inside. She did feel a small spike of pain bloom up into her stomach, so she did have to ask Sans to stop for a bit, just so he could allow her to adjust. He decided to reassuringly rub her thigh in the process. 

"it's okay, i've got ya, okay? how are ya feelin'?" 

"It f-feels weird... But it's a good weird." Frisk said, just waiting a little longer before she felt like she could allow her boyfriend to move any further. When she did feel ready however, she gave him the green light to keep going, and she couldn't stop herself from continuing to moan, while he groaned with her until he was all the way inside. Already, he thought she felt fantastic, and he hoped that had been clear by the sound he had made when pushing inside of her. He gave her a few more minutes to adjust to this, not wanting to cause her any pain. 

Once more, Sans questioned whether or not she was ready. When he got the answer that she was, he could only grin sweetly, glad that he wasn't causing her any discomfort. Seeing as she had given him the invitation to begin moving, that's exactly what he started to slowly do. And when he began with his slow movements, he couldn't help but grin with pride at hearing Frisk's small moans, which were a result of his actions. She sounded so perfect. 

Frisk felt so unbelievably loved as she clung to her boyfriend, feeling each and every movement from him while continuing to whine alongside his deep groans of pleasure. She just had to tell Sans how much she loved him, even if she was already a slight moaning mess. "Ah! S-Sans, I-I love y-yoou. I l-l-love you so much." She panted, hearing him let out a small growl. 

"i l-love ya too. so m-much." He growled out, continuing to be as gentle as he could be with her, until she felt she was prepared for him to go a little quicker. The couple went on to make those noises in unison, while sharing kisses here and there. With Sans continuing to thrust slowly into her, she knew she was getting to the point of wanting to feel more. Deciding that she wanted to feel more, she asked for it, only to get exactly what she wanted in return. And God, did it feel perfect. There was no way that she wanted this to stop any time soon. 

"S-S-Sans! P-Please! Ah! Yes! Ahh, ah, ahhh!" She pleaded and cried out, not finding it any easier to make such sounds that made her self conscious. However, Sans seemed to enjoy them, so there was at least that. She also enjoyed the things that came out of his mouth, the grunts, the groans and even the profanities. He sounded so extremely handsome when he let out what he did, and it only helped her along quicker, helping her pleasure build up.

"fuck! y-ya sound so great. god. k-k-keep it up. haahh. keep makin' t-those sounds, please." He slipped in a small word there to hopefully motivate her to continue moaning for him. And that was simply just the word of please. Hearing her enjoy what he was doing truly gave him the motivation and the drive to keep going. It let him know that she was loving every second of it, and that he wasn't hurting her. Not just that but it really pleased him too, so he just had to hear them. 

Really beginning to sweat and pant, Sans pressed his forehead to Frisk's as he continued, feeling her breath on his face all the while, while he could feel himself beginning to shake. Not because he was cold either, (considering he actually felt extremely warm), but because he was beginning to get close. God, he hoped Frisk was too. He wanted to be able to satisfy her. He didn't want her to feel disappointed that she wasn't able to go over the edge, as he wasn't able to help her finish. He had to last just as long as her, and he wouldn't take any other option.

"f-f-frisk, i'm g-gettin' c-close." Sans panted out. "please ahh! p-please tell me you're close!" He couldn't believe he could actually hear himself say such a thing. It's not like it was any easier hearing his own sounds. But he just needed to know if Frisk was going to let go soon. He didn't want to finish until he knew she was ready to do so. He felt so damn relieved by her response. 

"Saaans! I am! Yes, I am! Please!" She cried, not being able to hold her cries back now that she was just reaching the edge. He could only smile, wanting her to finish, wanting her to lose herself in the ecstasy of her pleasure. He didn't want her to hold herself back, not one bit. He wanted to give her the motivation to go on.

"do it, frisk! let go! do it for me!" He demanded, and almost upon command, Frisk desperately cried out his name, as her muscles tightened and her toes curled, along with her eyes closing tightly as she let her climax wash over her. It was so damn satisfying to see her pull that face, it had to be the most adorable expression he had ever seen on her. But seeing as she had finished, he finally allowed himself to follow after her, groaning as he did. 

Utterly panting and being out of energy, the skeleton lightly flopped on top of Frisk, resting his skull beside her head, his face buried into her cheek. Frisk could only smile tiredly, keeping her arms around him, as she too was lost for breath while trying to recover. They stayed silent for awhile, needing time to really get their breath back before either of them could speak. 

"G-God... That was... The best." Frisk muttered, hearing Sans quietly chuckle into the side of her neck in response. She could tell just from that alone that he had agreed. "We should probably... Get some sleep... I'm exhausted." She said, and Sans nodded. He waited a minute, then he went to pick himself up so he could pull himself out, get rid of the condom, and then he could lie down next to her once more, cuddling close to her with a soft smile. "I love you, Sans..."

"heh... i love ya too..." He said. 

And with the covers pulled over their bodies, the couple fell into a comfortable slumber within each other's arms.