Undertale AU One-shots

- Cheater! Underfell Papyrus x reader x Underfell Sans (part 2)

Sans and (Y/N) had now been dating for a few months now after the barrier had been broken. To say that their relationship was perfect would have been a huge lie. Their relationship was far from being perfect. If really, it was even worse than the relationship that she had with Papyrus. Thought even if she knew that she wasn't going to leave Sans. Why? Because they both needed one another. They were dependant on one another. Whenever the other needed help, the other was always there. Even though they hurt each other in the worst ways possible, they still seemed to return together in the end. This was the closest to true love they would ever get.

On this specific day (Y/N) had decided to head out into town to buy some things for Easter. In the underground, they would never Celebrate such things, so it was an exciting experience for both her and Sans.

While walking around the shop, she had met up with a few friends, and they had been chatting. She was really spending her time at her fullest. How could she not? She was in a great mood. Both her and Sans hadn't gotten into a fight this week yet, and this had been the longest time they had managed to keep each other from doing something stupid.

"So, how is your new relationship going so far?" Asked Frisk while taking a sip of her coffee. The two had become friends the moment that Frisk stepped foot into Snowdin. Right now they where in a coffee shop, just catching up.

"Oh, It's going better than my last one" That was a lie. Even thought Papyrus never loved her, he at least respected her. But she didn't care too much about that, she needed someone who loved her and would always return to her in the end. That's exactly what Sans did, even though (Y/n) didn't really feel anything towards him in the end. "I mean, he loves me, so that's better than what I had before" Frisk couldn't help but laugh at that statement. (Y/N) felt a smile appear on her face too, as she added "How about you? Got in a relationship, or still flirting your way through life?" Again, Frisk couldn't help but laugh "You know me well! I couldn't keep a relationship longer than a week, to be honest, so I'm just going around, being who I am."

Their conversation had kept going. Talking about the most random things, until one small part of their conversations made (Y/N) freeze up. "So, you and Sans are going to have a party for Easter, right?" (Y/n) slowly nodded her head. Both of them loved parties so it only seemed natural for them to start one when such a thing as Easter came around. "Oh yeah, we will. You're totally invited" (Y/N) said, before Frisk shook her head "Of course I am. Even if I wouldn't be, I would get there somehow. I mean, what's a party without the life of it, Frisk? But that's not why I asked you this question."

At this point (Y/N) was a little bit interested. "Oh? Then why?" She asked as Frisk began explaining "Well, Sans is your Ex's brother, right?" (Y/N) could only nod her head "So it's natural that he will come to the party too, right?". To be honest, (Y/N) hadn't really thought about that. She even had forgotten that both Sans and Papyrus were related. How could she not? The only thing that made them similar was the fact that they where both skeletons. Nothing more, their appearance was completely different, and their personality was so opposite to the other one.

"Well, I guess you're right. It will be a little bit awkward but it doesn't matter if real. We probably won't even meet up as Papyrus never goes to parties like these. There is nothing to worry about" But if only (Y/N) would have known how wrong she was at that moment.

A few days passed, and the date of the party had finally arrived. With a few preparations, everything seemed perfect for the party. "Is there anything else we should prepare, Sans?" She asked while Sans finished up putting the snacks around the house "Nah, sweetheart. I think everything's good.".

(Y/N) always loved being called pet names. It always made her feel a lot happier, so she always felt good whenever Sans would call her something like Sweetheart or darling. "Well, If everything's done, how about we sit down and watch a movie while we wait for the guests to come?" Just as she said that someone rang the door, as Sans said: "We can watch a movie after the party then?". She only nodded her head, heading towards the door to open it.