(So I am going to say this. I doubt that this chapter is what everyone is expecting. Please keep in mind that you, (Y/n), are very strong mentally and physically. I don't want to shy away from this character aha. Dare I say that you have... backbone? Ha. Anyway, enjoy!~)

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

This was no longer some kind of debate, I knew what he wanted and I wasn't just going to give into it. I had my prototype, there was no reason for me not to resist against something like this. Against something so forceful. Sans retained damage to his skull, and so, it made sense that his thoughts were much more animalistic. He couldn't think straight.

The only way to beat an animal who saw themselves as dominant, as an alpha, was to challenge them. I was not some kind of fragile Human that would just submit to him, and he knew it. That's why he took many precautions in pinning me against the door.

Papyrus clearly had no fear when sending me into the lion's den. He knew that Sans had a bone to pick with me, and he also knew that I would need to resolve this. And if I needed to bend his pride to do it- then I would. Silver lining?

I wasn't going to deal with his attitude.

I knew that he was trying to put a mark on me, and that he wanted this to be done in the safety of his room- his territory. Again, he was acting like an animal... which was surprisingly normal for a lot of skeleton Monsters. Gaster described this to me once. He claimed that skeleton Monsters had a more primal instinct to defend what their Souls accepted as a mate. If you were... unlucky enough to be claimed by one of these Monsters, you were very unlikely to escape from them.

Normally, you could just deny the bond that they felt- but I couldn't deny that I like Sans. My Soul's response to his approach was only fueling his act, however. That didn't change the fact that he wasn't going to give me an actual choice. After everything that happened here in the Underground? Sans wasn't in a right state of mind. A intelligent individual that lost their sanity was much more terrifying than when they were sane. Their mind works faster, and it will always leave little to no room for argument.

Not to mention Sans' fractured skull. He couldn't think straight with damage like that done to him. A skeleton with an injury to their head was a terrible thing to behold. Usually, it could be healed immediately to prevent them from slipping into insanity. Although, with further investigation I learned that Sans' one was going to be permeant. He wouldn't always be rational. Especially not now.

Ugh, this situation wasn't rational. Especially since it was far from some kind of marking. If I let him do anything like that to me, he would just be at my back at all times... snapping with some kind of feral edge. If Monsters haven't gone through hell and lack of food down here, I would have been more trusting towards his antics. But since everyone changed drastically and went crazy, I had to accept that Sans would always be far from himself. Right now he was trying to push me into a relationship, and I wouldn't be forced under his dominance. "If you truly want this, Sans. Then I suggest that you make an effort to obtain it. Because I refuse to lean into this primal aggressive instinct of yours. I will not be treated like some kind of fragile doll by your animalistic side."

He chuckled darkly, leaning in close with his mouth parted to reveal a set of very sharp fangs. He was getting very close to my neck, ready to place a primitive mark upon me. But I wasn't having it. Suddenly, I shot my head backwards to hit his own, effectively knocking his skull back and loosening the grip.

Slipping from his grasp, a loud snarl echoed through the room. He was bearing his fangs at me, warning me to not disobey him. Lowering my body down, I had to make sure that his teeth didn't sink into my skin, if he managed to pull off an inch of depth, he would have his claim. Now I just need to insure that he wont use magic. "Your body is weaker than mine, Sans. Why should I respect your dominance if you cant even physically restrain me?"

His growl pierced though the room, trying to intimidate me. If I knew that a kiss would have this kind of effect, I might of looked for an alternative. The route might of been simple in the beginning, but it twisted into a maze later on.

The skeleton suddenly moved forward in a charging position, I moved out of the way only for him to stop. He turned around on his heels, slashing at me with the sharpened tips of his fingers. I knew that some skeleton Monsters could be aggressive with their approach to a mate, and Sans was no excuse between his head injury and progressively terrible past. Sometimes, a mark wasn't enough for a skeleton and they would instead leave traces of wounds on the body of their opposite.

Gaster told me that even if it was just a simple interaction between the two, the dominant who was usually a male would not hesitate to display power over the other. Now I had to wonder... was he preparing me for something like this? For Sans?

Skeletons were the most possessive of all the Monsters. Mainly because their Souls were much more sensitive to the world around them- especially someone they loved. And for a situation like this where Sans lost his sanity awhile ago? I wasn't too surprised to see him fueled by a deep obsession. He was probably a bit of a sadist too.

The elegance of my movements for someone who was this tired did not go unnoticed by him. Sans clearly had planned to spend the next few hours with his fangs in my neck, holding me close to him in a forceful grip. That was another thing- Monsters apparently needed to maintain their bite for a period of time for their magic to seep into the wound. Longer bite meant more potent effect.

So an inch into my skin would be enough to be considered a mark, and approximately a minute or so would be enough to initiate the process. Almost like a snake bite... how irritating.

With my lack of attention, he managed to grab on to me and sink his claws into my coat to the point of feeling it in my skin. I froze slightly, and instantly removed the piece of clothing to shrug him off. It was probably the first time that he saw me without it, giving him a first real glance at some of my curves.

The shirt that I wore under was a tight black tank top, effective for mobility. Below I wore tight jeans that were also black in color, but they seemed a bit dull. With that coat on, no one could really see my clothing below. But now it was visible. And if I were being honest-

I felt cold.

Sans however seemed to grow more flustered at the sight of my (S/c) skin. He had easier access to it now with the piece of clothing stripped from me. Slowly, I started to remove my delicate scarf to avoid it taking damage. "You gonna keep strippin?"

"Ha. Such an interesting question. Tell you what, Sansy."

He suddenly grew serious, taking a step forward with a low growl. "If you can take it off, which I highly doubt-"

And right then and there, he lashed out at me with a ferocious attack. I narrowly managed to move out of the way with grace, however, it didn't take long for one of his nails to cut against my exposed flesh... drawing blood.

Sans pulled back his tainted finger to lap up the blood greedily, groaning at the taste. Glaring at him from a corner that I was hiding in, I glanced over at my wound with slight irritation. "Come 'ere."

He huskily demanded with a slight gesture of his hand. I narrowed my eyes in defile, and his smile seemed to falter. "Come. Here. "

"No." I firmly stood my ground, glaring at him. He was trying to be controlling, and the slightest amount of spilt blood was putting him into a frenzy. After all this time in the Underground, he learned not to waste what he saw as food. And my blood?

To him it was a delicacy.

Again Sans lashed out, grabbing my bare arm where the cut was with his grip, only for me to use my legs to sweep out his own from under him. He fell to the floor, pulling me on top of him through his relentless hold.

Taking the closer proximity as an opportunity, Sans tried to sink his fangs into my hand. He wasn't able to dig it in by even a centimeter before I managed to pull away. Once I regained my balance, I moved on top him to straddle his hips, pinning his hands above his head at the same time. "Are we done yet?"

He growled out of annoyance, his eye flaring to life. "No. I will not respect you if you use your magic, Sans."

It died down soon after, which I was thankful for. Sure, I was lying about what I told him. I didn't want Sans to mark me, especially since he wasn't very stable. But with his persistence, I doubted that I'd have much of a choice. One day, he would snap again and achieve what he wanted.

Not that he wasn't still lost in his instincts... he was still giving me a low warning growl to get the hell off of him and let him try again. So what can I do to bruise his pride more?

"Alright, lets go again shall we? I will prove to you our difference in superiority."

---Aliza's Pov---

Papyrus casually sat in front of me with a blank expression. Both of us were never moving, not after the frequent loud banging that we heard from upstairs. Scratching on the wall, loud stomping on the floor, growling from beyond Sans' door... it sounded like there was a fucking wolf in there, trying to beat someone into submission.

And Paps? Well he seemed perfectly fine with whatever was going on.

Looking back towards the door, I heard another loud bang, and then... silence. It has been almost four hours since (Y/n) went in. And now, the door opened to reveal her coming out. My mouth opened in horror at the thought of her surviving- whatever that was?

She walked down the stairs normally, as if nothing just happened. Only to walk up to Papyrus in a tank top with her arms crossed. She looked like she just came out of a long fight. Her arms were covered in scratches, her shoulders had a few faint bite marks and bruises... a bit of blood stained her (S/c) skin. But all in all, she looked fine. "Papyrus. Tell me the truth. Is it his week?"

Papyrus let out a hum in confirmation, causing (Y/n) to sigh with annoyance. From upstairs, I could hear a small groan of exhaustion from Sans... what did she do to him?

Not to mention... was he snoring up there?!

"SO I SUPPOSE THAT YOU WON THE FIRST ROUND, (Y/N)?" He asked with a small laugh. She shrugged her shoulders while pulling out a somewhat broken seat to sit next to him. She was tired- would this be a good time to try and kill her? "WHAT NOW?"

"I'm exhausted, and he is aware of that. While he gathers his energy, I will be slowly losing mine by staying awake to avoid him." She said with a small huff of annoyance. Was I missing something? Wasn't he trying to kill her or something? "Ugh. To be perfectly honest, he isn't going to stop until this week is over. I might just hide in the True Lab until his little fit is done. I doubt that I can handle another session with him. One more hour, and he probably would of succeeded."

"YES. MATING SEASON FOR A SKELETON CAN BE UNBAREABLE. IT ONLY OCCURS WHEN THE SOUL HAS SOMEONE OF INTEREST. HE WILL GROW DESPERATE OVER TIME, BECOMING MUCH MORE SLY WITH HIS ATTEMPTS... NOT CARING FOR YOUR RULES."

She smirked at him slightly. "You caught me, Papyrus. How did you know that I set rules?"

"BECAUSE OTHERWISE... YOU WOULDN'T HAVE BEEN WALKING OUT OF HIS ROOM."