Undertale one shots

female sans x male reader lemon (gender swaps)

(why am I doing this's?) I
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It's been about 3 years since you and sansy (sans) started to be boyfriend and girlfriend and 7 months since the monsters have been on the suffice. It's been quite fun dating sansy aside from the fact that she is over protective

*flashback*
It was very VERY cold on the suffice since it was winter so since Undyna(undyne I could not think of the boy version of Undynes name so I just put a A instead of a E) was to busy doing things Alphys cuddled up to your soft comfortable jacket/sweater/whatever you use to keep you warm which made sansy made mad. She also cuddled up to you and gave Alpha(Alphys) a look saying 'he's mine back of!' Thinking that you did not see it when you secretly did 'so cute' you thought to yourself.

*end of flashback*
You lying down on the couch with your arms on the back of your head to keep your head comfortable and you were resting your eyes until you heard the door open,you knew it was sansy cause of it was tempus (papyrus) then she would of forcefully pushed the door open. You kept your eyes closed cause you wanted to go to sleep,you were about to until you felt a head nuzzle agents your chest,you open one eye to see its sansy. You closed your eye and pretended to be asleep.

Sansy carefully climbed up to your chest and put her covered pussy on top of your shorts/trousers/whatever you use to cover your boxers where your dick is,she put her skeleton hands on your abs/shirt/whatever to keep herself up and her legs were spread apart. You still pretended to be asleep since you can tell that she thought you were asleep because she tried her best not to wake you up,she started to thrust agents you cock even though you both were still in cloths 'she's in heat,isn't she?' You thought to yourself as you heard her moaning but trying to stay in quiet, "*moan* (Y/N) *moan* m-more" you heard her say/ moan in a whispering voice.

You opened your eyes and sat up to let her know you were away "(Y-Y/N) I was urr...." She said while blushing and sweat dropping from her head " heh I was awake this whole time" you replied with a smug grin. You pinned her to the couch making her blush even more making her look like a blueberry,you started to lick,bite,kiss and suck on her collar bone making her moan in pleasure "*moan* yes... (Y/N) *moan*" she moaned with lust in her voice. Her pin pricks turned into hearts,her legs were wrapped around your waist and her arms were wrapped around your neck,you pulled away from her collar bone and give her a quick yet passionate kiss "strip" you commented,she nodded and took of all of her cloths. She already summoned a ecto pussy and breasts, you started to lick her pussy and massage her breast at the same time making her eyes (?) Role to the back of her head and her ecto tounge stick out of her mouth while moaning out your name "*moan* (Y/N) *moan* I-I'm gonna c-cum a-ahh" she screamed as she cummed in your mouth.

You licked up the cum and swallowed it,it tasted good. Suddenly, sansy flipped you both over making her on top and started to suck you of "*moan* on baby.... Your... So good *moan at sucking *moan" you could not even finish your sentence because of all the pleasure you were feeling, you stroked sansy's hair that she somehow has as a way to say thank you,you cummed after a couple of minutes and sansy pulled out while swallowing all of the cum from her mouth,you flipped you both over so that you could gain back dominance and entered her making her gasp in pleasure,you both have done this before back when you both were in the underground dating since sansy gets her heat ever month or 2 so this became regular for you to of in other words you both did not feel the pain.

Her eyes yet again rolled to the back of her head while her tongue was sticking out of her mouth in pleasure,she put her legs around your legs to make you go deeper which made her a moaning mess "*,moan* f-faster *moan* harder *moan* p-please *moan* " she moaned and you did go faster and harder.

You both cummed of what felt like minutes when it was 7 hours because know much pleasure you both felt time went faster,you pulled out of her and breathed heavily from how tired you both were, "so..... Was that good enough for ya?" You asked,sansy moaned happily and fell asleep. You put her on top of you so that she was lying on her chest and put a blanket on you both.

Bonus:

*the next day*

You and sansy woke up, put on your cloths that were lying on the floor and headed for the kitchen since you both were very hungry. Sansy got her ketchup while you got (f/c) (favourite serial), just then tempus came in probably to make some spaghetti, "heya sis" sansy said
"HELLO SISTER I HAVE A QUESTION TO ASK"
" Oh? What is it? " Sansy asked
",while I was making puzzles I heard you and the human/(Y/N) (if you are a monster) making some weird noises. What were those noises and why were you making them?"
You and sansy flinched slightly ",urr it was nothing sis" Sansy said "come on (Y/N) let's go to grillby!" Sansy said while dragging you out with a blueberry face leaving a confused tempus behind.