All Undertale AUs x reader One-Shots

Mine and mine alone. YandereUt!sans

Y/n pov:
"Yeah thanks see you guys later" I said waving goodbye to mettaton, blooky, and alphus. I close my front door as I walk into the living room and watch tv "hmm I wonder if there's any thing interesting going on, on mettatons show tonight?" I said thinking,while I was thinking I heard a door bell rang in my front door. I walk to my front door and open to surprise to see a old pal. "Sans" I said smiling warmly to sans. Your wondering why I call him a old pal? Well when I was younger I was always with sans 24/7 and there was a reason why I stopped hanging with him but some how I forgot why though, but I just brush it off. "Heh hey there (y/n) how you've been?" Sans said smiling like he usually do oh how much I missed him "I'm doing great! How about you?" I asked as I give sans a hug, sans hugs back "I'm going great " he said "how's it going with papyrus? Is he still making spaghetti?" Sans laughs "yep but he gotten better the past few years" I giggle "it'll be great to see how's he going" I said and then things got quiet.....sans looked serious at that moment "hey (y/n) can I ask you a question?" Sans said seriously "of course you can sans" I said kinda nervous to hear what he's on a day next "why.....why did you leave me that day?" Sans ask now I gotten uncomfortable at this question but I have to answer it I didn't want to look rude it got quite for a minute until I said something "I..I don't remember why I did it might be that I didn't want to be a burden to you" I said quietly but sans could still hear me. "Why don't we go back like we us to do" sans said as he's left Eye flicker to neon blue as he stare straight in my eyes like he was staring to my soul my spine shivered in fear I felt like I know why I did left him but can't find the right words for it. I back away from sans "s-sans what are you about to do?" I asked sans didn't reply anything he just kept on staring me then he just smiles.... But it wasn't the smile i use to know this wasn't the sans I known in my childhood. I was about to run but was knocked out by sans "shhh (y/n) you need to sleep" sans said with some what a creepy smile and that was the last thing I saw as everything gets darker.

Sans pov:
I finally have (y/n) to myself. "No one will ever take you away from me my precious (y/n)" I said as I hug (y/n) sleeping form and kisses her forehead. Soon (y/n)..soon well be together forever no one to spread us apart.

Y/n pov:
I open my eye lids to see a unknown room....wait is this a basement? I try to get up but felt something pulling me down I look up to see a iron chain around my wrist and ankle I try to pull it again and made a loud noise I was about to scream out for help until "He" came. "Oh your finally awake my precious (y/n)" sans said as he walks up to me and grabs ahold to my chin and lift it up to look at him "sans why? Why are you doing this to me? I thought you were my friend?" I ask sans looks at me "why? I'm doing this cause I love you (y/n)! As friends? You thought I was your friend? Well your wrong my precious lil angle I'm your lover not friend but lover" sans said with list in his eye as he kiss me. I pull away "lover?? When did you became my lover?!" I asked sans chuckled "I've been your lover when we first met each other" sans said "Sans your insane! I never loved you that way!" I yell at sans "I knew you were gonna say that but that doesn't matter cause I'm still gonna be your ole and your gonna be My lover as well" sans said as he gets even closer to my ears "and I know how to mark you as my lover" sans whispers in my ear as he licks my right ear, my back shivers. "Your mine and mine only you hear?" Now I remember why I left him.....

What the hell did I just make....oh well I hope you all enjoy this weird chapter and I'll might make a YandereUf! Sans next