(As I suggested, these last few chapters will be longer, probably around 3k+ words. I want to cap it off at forty chapters, but I do have a lot of content to show in this before it can be concluded. Also, this chapter has some sexual content- read at your own risk or just skip it aha. There also shouldn't be too many errors, but it is a longer chapter. Enjoy!~)

---(Y/n)'s Pov---

Quietly we held each other, not bothering to talk since we were perfectly fine with taking in each other's warmth. Although I couldn't perceive his thoughts, I took no time in pushing my forehead against his. The gesture appeared to be appreciated by Sans while I rubbed circles of comfort along his spine.

It wasn't too loud, but neither was I oblivious to the purring noise that he made. Finally, once I sensed him coming out of his animalistic state... after two hours of it, I let out a hum of content. "Are you alright?"

"Seriously? You're askin' me something like that?! You were the one who got hurt..." He stated lowly, his voice was deep and underlined with fear. Obsessively, the skeleton pulled me further into him, seeking comfort in the knowledge that I was alive. "Why... would you do that? M' supposed to be the one takin' care of ya."

"You don't need to take care of me, Sans... regardless, I am just glad that you were not hurt." I replied honestly. He blinked suddenly with a look of confusion before finally finding some kind of decent answer.

"One day, I will take care of ya. You won't have a say in it, and I will be perfectly content doin' it."

Chuckling at his statement, he seemed to be set on his words. My eyes slowly moved towards the door which was now closed, causing Sans to let out a low growl with the immediate thought that I was considering leaving. "Relax, bones."

He raised an non-existent eyebrow at the small nickname that seemed suitable for this very moment. Closing my eyes with a deep sigh, I knew that the feeling was faint but that it was definitely still there... "Seven."

Sans gave me a look of confusion, causing me to explain myself. "I am certain that there are seven more Humans here in the Underground. They are not close... however, they do have malicious intent."

"How do ya know that?" He asked while readjusting his hold on me so that he could keep me closer for a sense of security. Humming in acknowledgment, I guess that I never did tell him... he has been piecing it together, but he does finally deserve the explanation.

"It took me awhile, but I managed to learn how to use my Soul trait properly. It represents perception within its lilac color. A mixture of determination and integrity. The very concept of those two traits allows me to be deeply connected to both the honesty in people, and myself. I can practically define right from wrong... and with my determination, that is completely amplified. Strong to the point of being able to sense ill intent from others... which leads me to detecting even the faintest of lies."

"I see... too bad that ya didn't fall. If it was you rather Frisk with the ability of RESET, maybe this would all be different." He mumbled more to himself than to me. I tilted my head at what he said before deciding to use a single hand to guide his stare into my own.

"I doubt that I would of been able to Reset. I have determination, but I cannot amplify it like they do. Perhaps I would be able to catch a glimpse of the screen, save or even load options. But I do not possess enough determination to actually press them."

My words seemed to easily reassure him that I'd never be able to betray him with such a power, but I do not think that he was hinting towards that idea. "Can I take off your coat, cupcake?"

Nodding to his question slowly, he released his hold on me to remove the piece of clothing. His eyes snapped towards my wound, traces of his saliva were keeping it closed while his magic from the mark that he gave me worked to seal it properly. He was also now capable of taking in every curve... and he did just that by gliding his clawed fingers against my sides. "When I force myself to be emotionally neutral, do you find it hard to figure out my intent?"

I blinked from what he asked, shifting slightly in his lap with caused him to let out a low growl from the movement. "I actually have a difficult time picking out anything aside from negative intentions... growing up, I was never really introduced to enough... positivity."

"So ya can't predict what I want?" He inquired before finally resting his hands on my hips in a very firm grip.

"No-"

"Good." And just like that, I was thrown under the skeleton who immediately made a move to straddle me. I really couldn't predict his next movement, because he wasn't handling it with the desire to hurt me... this was similar to many different times in the past. However, there was one thing that was completely different now from then-

It was the fact that we were now Soul Bonded. As a result... he was practically pushing his own lust on me. Just like I was told, one Soul would experience the feeling and then sometimes transfer it to the other one. "Sans..."

"No." He decided with a deep chuckle. One of his hands moved to cup my cheek while his other went towards the side of my head on the mattress to stabilize himself. Sans leaned down slowly to press his teeth against my lips- but I wasn't expecting for his fangs to part to reveal his tongue. He demanded entrance, so I actually decided to give it to him. The kiss aggressively lasted for almost two minutes, with him nipping frequently at my bottom lip before finally pulling away with a devious grin. "Good girl."

And that is when I snapped. Both of my hands moved up to press against his bare ribcage, shoving him back into the bed so that he was off of me. Once his spine firmly hit the mattress, I assumed my own position on top of him. The shift in dominance was enough for him to give me a growl of irritation... so I smirked casually. "Is something wrong?"

I inquired with a hint of innocence as his hands moved up to once again grip at my hips. I was quick to remove them, only to instead push them over his head with my own. Again, he growled at me... this situation was making it much more simple to predict him, especially since it was pissing him off. "I'm just thinkin' that ya might need a lesson in submission."

"I apologize, Sansy... but I am not the submissive type." I replied while leaning down towards him. He seemingly managed to calm down to neutrally hide his intentions, and it was very unnerving to pretend that I could actually sense his next move.

"M' gonna teach ya all about it, (Y/n)."

Him using my name like that really caught me off guard... especially once he used his knee to unexpectedly shove my straddling position forward. I wasn't pinning him down as if he were an enemy, and that is where he received an advantage... but I was determined to make this as difficult as possible for him.

Once my body moved closer to him from the impact, Sans immediately went to raise his skull slightly so that he could dig his set of fangs into my shoulder opposite to his mark. Trying to stay firm with my hold became increasingly difficult as the mixture of pain urged me to release him... but I didn't want to.

I could tell that he was making an effort to avoid using his magic... but knowing Sans? He wouldn't hesitate to cheat if it brought him closer to his goals. He learned how to take advantage of a situation, even if it was unfair. "You're gonna have to let go."

He slurred out. With my arm going numb from his bite, I was slowly losing my grip on him... and he knew it. Even though Sans could overpower me right now, he held strong with the interest of watching me struggle. But no matter what, I wouldn't give him that luxury. If I wanted to be given any kind of freedom from him, my mate and my bond... then I had to insure that he respected my strength.

Feeling his tongue against my skin, I could tell that he was making every effort to lap up the blood... but when I refused to give in, Sans finally decided to struggle against me. It took him about five minutes until he eventually got a single hand free. Using his free grip to pull off my other hand, the skeleton soon released me from his vicious bite.

His tongue ran over his set of fangs, tasting the remainder of my blood before he forced his body to sit up with me surprisingly still in his lap. Since I kept straddling him, I could start to feel the heat building up in his pelvis... along with the firm feeling of something grinding against my inner thigh.

My fingers instinctively wrapped around the rim of his ribcage as I steadied myself against him. He was taking in several heavy breaths, losing himself to his lust while his single crimson eye examined me thouroughly.

After about a minute, his hands trailed down to tug at my black tank top, effortlessly removing it from my body to reveal my (S/c) skin. Slowly, Sans' hand trailed over something that I generally kept hidden from the world... I even tried to pull away slightly once he started to measure the length of that scar.

His finger tapped against the old wound, showing his increasing lack of patience without my explanation. "Tell me."

I didn't look at him, which immediately caused him to grab my chin between his thumb and index finger. Roughly, Sans forced me to stare at him directly... he looked very unstable. Pulling my own hands away from him, he growled lowly from the lack of physical contact... but I couldn't help it. I touched the scar, trying to figure out why he seemed so annoyed by it... it didn't close too well since it was my first attempt at stitching.

I mean, it was devastating to look at, and probably appeared really life threatening... ugh. Regardless, It won't change anything with him knowing. You cannot rewrite the past. "They knew how many people were in the house when they came. My parents did die first, but they were not going to allow a stranger to kill me. Since I was an easier target, my father apologized to me before slashing me with a knife. Once the killers assumed me to be dead, I managed to crawl into a closet which served as my hiding spot. No one returned to check on me, since as a child... I was no threat, and that they'd be burning the house down before leaving regardless."

Sans' eyes became heavily shadowed as I looked away. No one knew about that, well... except Gaster who watched in horror when it happened. He only brought it up once to me, claiming that Humans go to very extreme lengths, that were too barbaric in the eyes of a Monster. Although, once I gave him that look of sadness... he quieted down and never brought it up again. "You don't trust anyone."

"Monsters are not like Humans... so. I choose to trust you." I replied with a sigh. Sans' expression lit up at my words, but that didn't stop him from giving me a look of pity. He couldn't believe what happened, or that I even survived. Actually, he was angered at the fact of nearly losing his mate before actually being able to meet her.

And that pissed him off. "I promise to keep ya away from just about everyone. Unless I trust them..." He growled out with a sneer. I found his promise to be adorable, but not necessary as I simply gave him a small uneasy smile. He sounded very possessive when he said that. "If I were there, cupcake..."

He couldn't find the words to finish as I leaned in to peck his teeth. Sans seemed to groan into the gesture before pulling me in for a much longer make out session. It didn't take long for him to nip at my neck, leaving small marks along the skin. After his little attack, his phalanges made an effort in finding my bra strap... unclipping it to reveal my breasts to him.

When the concealing fabric was removed, I felt tempted to hide my exposed self from him... but Sans, being extremely sly, decided to distract me from that. He leaned forward to once again catch me in his aggressive kissing while he guided my arms around his neck. Once my mind was elsewhere, the skeleton reached his phalanges towards my breasts... grabbing them gently. "Mm... so soft."

He mumbled out with a squeeze before softly messaging them with equal attention. Holding back a moan as he once again leaned in to nip at my neck... I almost couldn't hide the sounds anymore. His single crimson eye looked up, watching as I lost composure. Soon, he lowered his nipping towards my breasts, biting at them which caused me to suck In a breath. Small cuts were left on the surface, showing his more animalistic nature despite his loving intentions.

Listening as he let out a chuckle, I really couldn't stop myself from wanting to get back at him. While his attention was elsewhere, I tried to regain my strength that he was desperately taking away from me... only to bring my face towards his collar bone where I decided to leave my own bite. At the feeling of my teeth against his bone, Sans shuddered and let out a groan. "(Y/n)."

Deciding to smirk, I pulled away to catch his gaze. Sans was staring at me with that half lidded look, appearing hostile. Watching as he pulled away briefly, I tilted my head at the distance that he put between us. "Take the rest off."

I froze at his demanding words, giving him a questioning expression before he growled threateningly. "Either you do it, or I will."

Crossing my arms over my abused breasts that found no relief in their frequent stinging, Sans did not look too amused by my disobedience. I wasn't planning on giving into him, that wouldn't exactly be fun. "Tsk. Always so difficult, huh?"

After he said that, my Soul was ripped out of my body. It was consumed in a blue glow to show off the use of his magic. I knew that I was pushing him, and that if he physically wanted this... that he was aware of the effort that would be required. Deep down, Sans was still too lazy and instead would be always looking for a shortcut. "Don't you find this to be somewhat... unfair."

He shook his head as his hands moved to remove my pants. Once they were gone, he then took off my undergarments. Lastly, his shorts came off to reveal a crimson glowing member. When I thought that he would aggressively start pounding into me, Sans instead displayed a more teasing personality. He didn't seem to be satisfied, and appeared to be looking for something else...

Slowly, he his teeth parted to reveal his red tongue. A saliva dripped from the surface of it as he moved it towards my entrance while forcing my legs apart. Careful with his first movement, Sans licked at my womanhood with a hum of satisfaction, enjoying what he managed to taste. After the first test of it, he started to attack it more between both his tongue and fingers. Honestly, I couldn't hold back anymore. Two of his fingers moved in and out of me while his tongue made sure to lap up whatever was available to him...

I let out a small moan... which caused him to grin sadistically. "Was waitin' for that sound..."

He pulled away with a hum of content... soon followed by him positioning his member at my entrance. I panted from exhaustion, and he made sure to time everything to avoid my release. At the feeling of him pressing himself against my womanhood, I called out his name shakily. "S-Sans....?"

I couldn't help it anymore, I felt powerless under him when he was literally making it impossible for me to fight back... this is what he wanted, for me to feel this way. He was taking pleasure in how I suffered, but also in the fact that he was making me feel good. And that sinister grin that he was wearing was enough to prove his enjoyment. "Don't worry, (Y/n)... let it all out."

So I did.

And wow did he seem content with my screaming... as if it were music to his ears.

---Sans' Pov---

I kept going for awhile, even if that did bring her to over stimulation. In the end, (Y/n) was sore... and I was more than happy. While I held her close, a low rumble shook my bones in the form of a purr.

(Y/n) was still naked, but I made sure to keep her close against my ribcage until we both calmed down from our previous activities. She was now not only marked and bonded by our Souls... but we were now mated as well.

But this new feeling... I was learning so much about her from our more intimate time together. And after I managed to fortify our relationship in so many ways... my animal instincts were screaming at me, begging for me to keep her away from the cruelty of this world.

So to shield her from everything that managed to present itself as a threat, I hid her away behind my body. I knew that if I could go back, I would of kept her away from everything that hurt her... and her father happened to be on my list. Despite that, I knew that I wouldn't be able to do anything except daydream that idea.

Sighing as I dozed off into a peaceful sleep with her so close, I took comfort in taking in our heavily mixed scents. Between a mark, her Soul bond and our sexual activities... there was no mistaking my claim. Or my devotion to her.

(Y/n) belongs to me.