Sans AU One-Shots

❀Classic❀ || casual love.

Pairing: Undertale Sans x Female Reader
Prompt: You need help studying up on your skeletal anatomy, so who better to ask than your skeleton boyfriend?
Type: smut
Length: 4.8k words
Background: Monsters have been on the surface for some time, you're in college, and you've been dating Sans for 2 years.
Notes: This is 100% based on my relationship with my ex (he was a lot like Sans lol). After you've been with someone for so long, your love is casual more than anything, and there's nothing quite like it. It's hard to forget just how good it feels to be so in love when you know the other person is equally smitten with you. It's one of the best feelings in the world, and I'm trying to portray that with this one-shot. So this won't be the fiery passion you usually imagine smut to be but the casual love of being extremely intimate with your favorite person - and to me, if we can goof off together while we're fucking, that relationship is built to last. | Concerning the research for this smut-shot, I hit up my ex so Sans' perspective in this is an actual guy's perspective. So trust I'm speaking facts (even if it makes no sense to a girl's brain). Also you get a free skeletal anatomy lesson from a biomed major <3 

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I didn't know how long I had been staring at my screen, but my vision was swimming by the time I realized that maybe I was doing a better job putting myself to sleep than studying. Arguably that's what studying did - or at least it helped me fall asleep faster than my melatonin did - but right now I needed to study for my Anatomy & Physiology exam tomorrow, not take a nap. It was on the muscular and skeletal systems, and while the physiology side - which was how things worked - I had down pat, anatomy just wasn't interesting. All anatomy consisted of was memorizing the names of bones and muscles and regurgitating that information into a multiple choice or matching test if you were lucky, or a fill-in-the-blank test if your professor hated you. There was no way to make that fun thus no way to make it anything more than a slog to get through.

I heaved a sigh and leaned my chair back into a wall I don't remember being there before, and I tilted my head back to see my boyfriend smiling down at me. "Sup dork."

"Sup nerd," I shot back, jutting my chin up towards him, and Sans met my silent request with a heavy sigh and exaggerated show of effort as he bent down to place a skeleton kiss on my lips. I made a hum sound in the back of my throat as he pulled away, smiling warmly at him as he rested his crossed arms on the back of my chair, setting his jaw on my forehead as he gazed lazily at what I was doing on my laptop.

"Looking at other skeletons' nudes, now?" he teased, winking a socket as his head tilted at the picture of the human skeleton on the screen with labels on each of the bones to help me learn their names, and I snickered as I rolled my eyes.

"Shoot, you caught me." I put my hands up with a shameful sigh. "Sorry, your tasteful nudes just don't cut it anymore."

His grin widened as he nodded, eyelights twinkling. "He's got a bigger coccyx than me, I get it."

I couldn't hold back my laughter anymore, reaching up to squeeze his smiling face between my hands as I leaned back to give him another kiss. "I'd use your pictures to study but we both know I already can't focus and that would just distract me more." He let out a deep chuckle, nodding as he stood to go take off his hoodie. "How was work?" I spun in my chair to watch him strip out of his attire, snatching his discarded blue hoodie off the floor to throw on, zipping it up and pulling the sleeves back so my hands could poke out the ends.

"Tiring." The word was quiet enough that I had to strain to hear it, and instantly my smile dropped. His perma-grin looked a little less genuine, and my body was moving before I even fully realized his eyelights had dimmed. He stopped what he was doing to watch me undress - 2 years into the relationship and he still checked me out every chance he got even though he'd seen me with far less on plenty of times. I put on thigh high socks that matched the blue of his hoodie, clipped mini belts around the top of the socks to keep them snug around my thighs so they popped, switched from sweatpants to short shorts, then threw my hair up and plopped onto the bed with my phone in my hand, patting the spot behind me.