undertale sans x reader one shots ♡

yandere gaster sans X (SENPAI) reader

So Im just going to do where you go to underhigh and how the monsters are out and this probably going to be a lemon soo ya (○ﾟεﾟ○)

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Y/N P . O . V

Ugh i was in the middle of my boring ass class.  Finally the bell went off telling everyone it's time for lunch. I packed up my stuff when I saw my friend gaster sans walking away with the guy I talked to this morning his name was Mike (random name) . I shrugged and then left to go to lunch.

Gaster sans P . O . V

I just took Mike who was talking to MY y/n to the boys bathroom.  "w-why are we h-here" he asked I knew he was afraid so I smirked. "oh just wanted to know if you had to go to the bathroom,  so go to the bathroom" I demanded. He ran into the stall and o grabbed a bucket of water and dumped it all over him while he was still in the stall.  He yelped and ran go reliving the lights were out.  He then to the switch but what he didn't know that I had took of the switch off.  So when he touched it BZZZZTCH he had fell and hit the floor and I jumped out the window then ran to lunch smiling.

She will be mine ~

Y/n P . O . V

I saw gaster run in I has been at our table waiting for him I always share my lunch with him.  He ran over and sat beside me and hugged me I hugged back. "sorry I was late Mike was showing me something then he disappeared so I came back as soon as he left" he said softly. "oh okay I was getting worried" I mumbled quietly but he heard and I swear I saw a yellow(or gold) hue on his face.  Then we started eating. "h-hey y/n would y-you like t-to come o-over to my p-place? " He asked nervously which made me giggle.  "hell yeah" I whispered yelled.

Time skip to after school and at gaster sans house

I was resting on gastys bed waiting for him to come out of the shower. He had just came out having a towel around his waist and that was it.  I looked at him and blushed then winked "wasup good looking" I said jokingly but he blushed a dark gold then next thing I knew I was pinned to the bed.

Reader Chan it's lemon time wink wonk haveeee funnnn =3~

Gastys towel was now on the floor and I was trying not to look down to his gold member. I was a blushing mess and then I smiled and kisses his teeth which made him blush more.  I wrapped my arms around his neck and he then hit his tongue on my bottom lip asking for entrance. I denied then he slipped his hand in my shirt and rubbed my left boob.  I gaped and he took this chance and slipped his tongue in my mouth. Our tongue fought while I slowly took off my clothes.  He then pulled away looking me up and down. "like what ya see~" I said smirking and he nodded.  He then put his glowing cock at my entrance "r-ready? " he asked and I nodded biting my bottom lip then he slowly went in me trying not to hurt me.  I moaned loudly and he kissed me to shush me up and he thrust faster knowing that's what I wanted.  He thrust faster earning moans from me. Then my knot slowly appeared "g-gasty i-im ahh~" I tried saying but he knew what I was getting at. "me too" he said then he thrust faster and with that we let out creamy goods out at the same time.  He then took it out of me and fell on my chest and I wrapped my arms around him.  "I l-love you y/n" he said softly "love you too gasty" then we both drifted off to sleep.

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Welp I'm done hope you enjoyed and I'm taking requests =3 also sorry this way really bad ;-; well bye 👋