How could you?

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by CassieWolf605

by CassieWolf605

Cheater!Science!Sans x Scientist!Reader

(I know I said I'd do a soulless reader thingy but I'll do it this weekend, I'm still potting it out, but I got this idea so might as well, if he title isn't enough to tell, it's sad okay? Prepare the tissues)

Your Pov

You took vacation days since last week, since then, Sans has been staying at work longer than usual. He forgot his lunch today though, papyrus might cry if he finds out Sans forgot his spaghetti so I thought I'd just carry it for him. While walking through waterfalls, I spot a familiar figure. "Hey Undyne! Wait up!" I called to my best friend, Undyne, she stopped and turned around "Y/n! hey!" She said with a toothy grin before giving me a noogie. "What you doing here?" She asked. "Sans forgot his lunch so I'm carrying it for him." I replied. "D'awww that's adorable, we could walk together then, I'm going to the lab as well." She said, so we walked there together talking about anime. When we arrived, I placed his lunch on the table while Undyne was going through a box full of anime, that was when we heard something, moaning, from the room Sans works in, we both look at each other then walk to the room, we open the door seeing clothes scattered everywhere, then what we saw shocked us, Sans and Alphys making out as he pumped into her quickly. (Didja see that coming?) "Aphlys?!" I heard undyne yell causing both of them to freeze and quickly part, when Sans saw me, he got a scared expression, I had no words, I ran out of the room with tears streaming down my face, I ran to waterfalls, not wanting to go home considering that I live with Sans, I just sat on the floor with tears streaming down my face, someone came and sat next to me, I looked over, it was Undyne, that was the first time I saw her cry, we hugged each other, letting all of our tears out, as strong and mighty as Undyne is, she cried longer than me, I'm not judging, she loved alphys, with all of her heart, as busy as Undyne could be, she still made time for Alphys. "Undyne? Is is okay if I stay at your place for a while?" I ask, my voice shaky from all the crying. "Not at all, that's what best friends are for, I have a spare room, what about your stuff?" She asked, her voice shaky as well. "I'll get them another time, I don't want to see him right now." I say, knowing he's probably home waiting for me to give his 'explanation' and 'apologies'. She nodded seeming to know why as well, we went to her place and watched normal movies, I don't think she'll want to watch anime ever again so I recommended a few movies to her.

~Timeskip~

It's been a week since, I quit the scientist job and now work with Undyne which gave me some fighting skills. I of course avoided Sans all the time, Toriel now despises him and doesn't talk to him through the door anymore, Grillby doesn't give him stuff for free anymore, no one looks at him the same anymore. today is the day I go to get my stuff from his house, he's supposed to be at work but Papyrus should be home, he had no school today, I knocked on their door and Papyrus let me in before running back into the kitchen, I walk into Sans' room since that's where all of my stuff are, I pack up everything I owned besides all of the stuff he gave me then I heard a familiar voice. "Y-y/n?" The person I never wanted to see again, I quickly spun around with a few bags in my hand. "What?" I answered him coldly. "Y/n, I thought I'd never see you again!" He said while walking over to me, I dropped my stuff and got in a fighting stance. "Get any closer and I'll put a crack in your skull." I growled at him, he looked at me in shock, then sadness. "Y/n I'm sorry-" "Sorry isn't going to fucking cut it! Get out of my way!" I cut him off and picked up my stuff again, shoving him out of my way. "You forgot those." He pointed at the stuff he gave me, I scoffed. "Why don't you give it to alphys you prick, you really think I'm going to take something you gave me?!" I said before leaving the house and going back to Undyne's, I plan on living with her, she did offer and I accepted, from now on the only things Alphys and Sans are getting from me is hatred.

(Phew! sorry the description on Alphys and Sans when he cheated, I read a lemon before doin this XD. well I'm gonna go now. boi.)