Underfell Sans x Soulmate reader

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There are many different soulmate au's but I am gonna use the one where they can write to each other on their hands.

Sans were just laying on his bed while looking at his hand. how long was it since he wrote. maybe only a minute, but it felt like an eternity. he waited in anticipation until, "SANS! GET DOWN HER IN THIS INSTANT! WE NEED TO GO OUT ON OUR PATROLS!". Sans groaned but still got out of bed. taking on his jacket made him realize he had gotten a reply. 'Stop with the puns, I'm dying of laughter here! people are beginning to stare thanks to how loud I am.' Sans smiled as he read over the words before heading over to his grumpy and waiting brother.

Sans had always thought that he would never have a soul mate. He were just a worthless piece of sh*t to everyone. so of course he would never think of having a soulmate. However, he actually had someone. Someone that would actually love him. not LOVE like he were used to, but true and pure love. He felt everyday a little more happier when he wrote to you. To say he were stunned when he found out he had an soulmate were an understatement. And for that soulmate to show him so much kindness and support made him fall a little harder. He had daydreams of holding you in his arm, breathing in your sent, hug you close to make sure you were real. He would love to meet you, but there were only one thing stopping that. You were a human.

You guys still hope and spoke of the day monsters were freed. Sans new one way that could happen, but he wouldn't drag you through the underground where you could get killed. Every time he thought about the chance of never meeting you make his soul break. He hadn't dared to say where the monster were trapped. lying to you how you could get in the underground to keep you safe. He would just hold out and wait for the day he could finally meet you, if it ever happened

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"no, no, no, no, no, no. this couldn't be happening" you look up from the bed of golden flowers from where you had fallen from. there were no way you could get out of here the same way. cure stupid caves. There has to be another way out. looking around made you notice an opening. getting up on your feet you made a bolt for the opening. you were determined to get out of here and back to your classmates. maybe a field trip on mt Ebott wasn't the best idea your teacher had. there wasn't any easier way up in the other room. scanning your surrounding made you see walls, rocks, plant with a face on it, vines, more rocks... wait! A plant with a face?

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Sans were half asleep at his post in Hotland. His brother were patrolling the borders of Snowdin so he couldn't catch him dozing off. He looked at his head and saw that you were writing to him. instead of getting that dumb smile of him as papyrus called it when he red what you wrote, he frowned. 'I have really messed up this time'. You had made a bunch of mistakes you were ranting about before, but Sans had this weird feeling that his was worse than the others. 'What is it now?' Sans felt him dozing off again. that was until he saw what you wrote next. He felt his soul stop. 'I have fallen down mt Ebott and nearly gotten killed a dozen of times. not one of my brightest moment.'

She were here. Sans didn't know exactly, but she was here! His worry for her safety were set aside by the amount of joy radiating from his soul. He would have the chance to meet his soulmate. she was a human, but he were sure Papyrus would let this one go when he explained what they were to him. 'wait... I just realized you are down here!" That made Sans snap out of his daze. a little hurt that she didn't remember he lived down here, but she may have focus on not to die. 'Where are you now?" Sans wasn't sure if she could understand what he wrote. it were nearly just scribbles.

He needed to stand up, to impatient than ever for her reply. his eye got wider when he saw she replied. 'a place called the ruins-" That was all he need. Sans quickly teleport ed to his station near the ruins and made a mad dash toward the huge doors. he look down and read the rest. She was feeling a cold breeze that came from two large doors. He didn't hesitate to knock. he heard a tiny squeak of surprise behind them. "Y/n ... are-are you there?" deem that stutter. he couldn't focus long before the door opened and a human peakt out. their eyes growing wider when they laid their eyes on him.

"Sans?" one word, and it sent shiver down his spine. he loved how you said his name. and god you were hot when he got a look at you whole body. he felt a blush sneaking in on him and tears forming in his eyes. he could only nod with an actual real smile. You got teary eyes as well while you jump forward and tackle him in a big hug that sent you both to the ground. your guys laughter filled the air. Sans was finally holding you in his gasp, took your sweet sent in and hugged you close to make sure this was real. you were finally in his arms and you would never leave his side.

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