Sans AU One-Shots

❀Swap❀ || monday. (HG)

Pairing: Demon! UnderSwap Sans x Summoner! Female Reader
Prompt: It's the demons' heat week, and (Y/n) offered to help them out with their urges.
Type: smut
Length: 2.5k words
Background: This was in Her Guardian as part of a spicy week-long bonus thing where each of the guys got a day of the week with Y/n to claim her. The goal of the heat week is procreation (i.e. making babies) and after mating, the heat urges go away. The Stars are a lot more respectful and restrained, thus less likely to make their intentions obvious like the Bad Sanses and seek Y/n out, but the heat still affects them (just less obviously). | Takes place on Monday - the first real day of their heat & before anyone else gets a chance with Y/n.
Notes: Lucky Y/n - the joys of being in a reverse harem, I suppose. Them being a demon only changes how tall they are (at/over 6'4"), their power (they're much stronger than humans), and how they see Y/n (among other things I explore in my full-length story that aren't relevant for this smut-shot). I tried to remove any information that pertains to the events of Her Guardian so you can read this as a stand-alone story and understand everything.

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The soft tunes playing through the music player in the living room were almost drowned out by the panting and gasping of the two people in the room, and Swap let out a loud groan as he held (Y/n) tightly. "I am so close, human!"

"You were really close that time," (Y/n) said lightly between heavy breaths, patting his arm as he let out a heavy huff. The two of them had been going at it for at least an hour now, and though they were both working up a sweat, it was a lot of fun, too. (Y/n) was out of practice dancing, but she was doing her best to guide Swap through the art form, teaching him as best she could, and he was getting a good grasp of it. There were always new things to learn as with any art form, new things to perfect or new moves to try, so while (Y/n) didn't know everything—even Swap taught her some new moves—the two of them were becoming nigh on perfect dance partners.

Swap put on a confident grin as he lightly squeezed (Y/n)'s hips from where she stood in front of him, his breathing coming in less obvious gulps as his chest rose and fell more steadily. Even for a demon, his stamina impressed her. It was his idea to workout, and at the chance to dance with both an enthusiastic and capable dance partner, she took the opportunity willingly. He had been tossing her around for over an hour and only just now had he stopped to regain his breath.

(Y/n) was dressed in clothes fit to be thrown around in: short black bike shorts that hugged her body snugly and a baby blue sports bra. She hadn't seen any other demons since Swap asked her to dance, leaving her as his sole focus, and his eyelights never strayed far from her. She knew it likely had to do with his heat week but she didn't mind the extra lavishing attention, and even if she didn't think her body was perfect, Swap's eyelights never once appeared anything but admiring. She suggested putting on a shirt if she was too distracting but he objected before she even finished the sentence, stating it would hinder her movement and she deserved to walk around in all her angelic beauty.

"I still don't know how you can pick me up so easily," (Y/n) muttered, shaking her head in bemusement at the demon.

"Picking you up is not the issue, it's how I do it in time with the song while also spinning, throwing you, then catching you." Swap ran his eyelights up and down her body, thinking deeply as his hands stayed nestled comfortably on her hips. The two of them had been attempting this particular move for at least 15 minutes with no success, and while the last try was nearly perfect, Swap messed up the timing and thus only tossed her a couple inches up.

"You got it." (Y/n) patted his arms again. "You just need to feel the rhythm in your soul and it'll move the rest of your body in time, kinda like how, when you're with a dance partner you have a strong connection with, it feels like they're encouraging your very soul to dance with them."