Neurotransmitters And Receiving Pleasure.

neurotransmitters and receiving pleasure.

you can't sleep, and spencer takes it upon himself to explain (and enact) how he can help.

cw: fem!reader, established relationship, smut, fingering, lots and lots of hormone talk, spencer is hot and gets blue balls but he's too obsessed w you to care

a/n: taking a class that involves a lot of memorising hormones and was thinking about spencer explaining it <33 im also just a sucker for intimate sleepy smut sue me, first proper smut fic!

wc: 2.2k

mlist

(reblogs are the only way to promote fics on tumblr! please reblog if you enjoyed it :) )

Dating Spencer Reid has been decidedly wonderful. He’s sweet, and above all else, attentive. Only a few months into your relationship, he’s somehow learned more about you than you thought was possible, putting that knowledge to good use.

It began with simple things like knowing your coffee order by heart, and remembering the names of your family members after you brought them up. However, it quickly became far deeper than that. He would be bringing oranges to your apartment when you’d gone through a stretch of cold after cold, making sure you don’t run out of the very specific brand of candles you like. You name it, he’s learned it and utilised it for you.

However, a side effect of his perceptive actions is that you feel horribly guilty about taking up too much of his time. He’s so busy, his job and friends and mother are so important to him, that you’re loath to take him away from the things he loves. As a result, you find yourself falling into the insecure trap of making yourself as little a burden as possible, trying to ensure that the things he does for you are because he wants to, not because you need him to. 

That’s part of what’s led you here, laying next to him in his far-too-comfortable bed, wide awake. 

By all accounts, you should be fast asleep at this point. It’s nearing two am, the curtains drawn so there’s only a soft glow of moonlight coming into the room. Spencer’s left arm is laid over your middle, fingers twitching occasionally to stroke the skin exposed by your (his) shirt riding up. You’re set up for the perfect night of sleep with your perfect boyfriend, but for some reason your mind will not shut up.

Your thoughts are racing from place to place, flitting around like an overexcited butterfly. The interaction you had at the local cafe this morning, the project you’re working on at work, the movie you watched with Spencer a few hours ago, the comfort of the heat radiating from his body. 

Letting a soft grumble of frustration escape your lips, you shift, turning to press your back against Spencer’s chest in a vain attempt to use his body warmth to lull you to sleep. Instead, you wind up thinking about him. Him and his pretty eyes, his lips, his hands, one of which is now resting over your stomach. 

Great. Now you’re never falling asleep. 

You decide to call it, wracking your brain on how to get out of his hold so you can at least wallow in your self pity in the living room without waking him up. Slowly shuffling out from under his arm seems to be the best option, at least to your sleep-deprived brain.

Slowly inching over the mattress, his hand drags over your skin, the slackness of his body allowing you to maneuver yourself halfway out of his grip, when suddenly his hand comes to life, fingers digging softly into your stomach.

“Wh’s going on?” His voice is deeper than it ever is, a slight rasp rattling through his slurred words, which only serves to wake you up further. 

You cringe internally, bringing a hand up to cover his. 

“Nothing, Spence. Just going into the living room.” He lets out a sleepy groan, attaching himself solidly to your back so there’s no chance of you leaving.

“Why? What happened?” His voice is slowly becoming more clear, lucidity returning to him quicker than you can attempt to soothe him back to sleep. 

“I’m fine, nothing happened. Just couldn’t fall asleep, is all.”

He hums softly, the vibrations reverberating against the back of your head. You can feel him waking up, lips moving against your hair.

“What’s wrong? Can’t stop thinking?” You bite back a groan. Of course he knows what’s wrong, even minutes after waking up. Turning in his arms, you bury your face in his chest, mumbling a plaintive yeah. 

His hand comes up to play with your hair, the soothing feeling bringing a sense of calm you haven’t had in hours.

“What have you tried? Maybe not counting sheep, because a study at Oxford proved that to be unhelpful, but visualising calm scenes apparently helps.” You shake your head, face still pressed against his sternum.

“Tried it. Didn’t work.” 

He lets out a small, reassuring sound that sends shivers down your spine. 

“I’m sorry, angel.”

You lay there for a while, but sleep never comes to take you. You’re sure he must be sleepy, but he stays awake, speaking after a long fifteen minutes of silence.

“Hey… Do you want my help?”

Poking your head up to see his face, you question him. 

“Help me sleep? How’re you going to do that?” He tilts his head down, and you can just make out the brown of his eyes as he looks at you.

“Orgasms have been proven to be very effective in putting someone to sleep. Y’want me to?” He speaks casually, as if he’s not suggesting anything out of the ordinary. You, however, lose all composure, flushing immediately.

“Spence, I— You’re tired.” He tilts his head to the side, and you observe his eyes sharpen in that unexplainable way they do whenever you’re especially intimate with each other.

“I’m not too tired. Not for you.” It’s like he wants you to melt for him. You can’t help but duck your head, a mortified squeak escaping your lips. He chuckles quietly, hand smoothing the hair at the back of your head as he waits for you to reply.

It takes a few minutes for you to pipe up.

“Do you… Does it really help?” 

He presses a kiss to the crown of your head.

“It should. I can explain it to you while I do, if you want.” It takes a beat, but you’re nodding, craning your head up so you can kiss him. 

“Okay, baby. Lay back for me? The supine position should make it easier for you, and it’s the best way for you to sleep after if you don’t want neck pain.”

As he speaks, his hand shifts, gripping your waist softly as he helps you lay back against the pillows. He props himself up with an elbow, so he’s hovering slightly next to you. His hand smooths down the fabric of your pyjama top, rubbing soft circles against your stomach with his thumb.

“Sleep deprivation can be caused by a lot of things. Stress, changes in schedules, intake of caffeine.” It shouldn’t be attractive. It really shouldn’t, but you can’t help but let out a shuddering sigh as he speaks, kissing your neck between words. His lips are soft, moulding to the sensitive skin there with reverence that makes you giddy.

His hand begins to move, tracing its way down your front, past your pelvis until it settles on your thigh. There it stays, making broad, sweeping motions on your upper thigh that make you want to squirm. 

“Spence…”

He chuckles, pressing one last kiss to the column of your throat before pulling back so he can look at you.

“I’m going to get there, don’t worry.” 

You curse at him in your mind, but you can’t bring yourself to make a sound at the moment. Not when his hand is moving dangerously close to the hem of your shorts. 

At first contact with the linen material, he pauses the motions, lingering there to play with the fabric. Bending your neck, you watch him, enraptured by the minute movements of his nimble fingers, skin hardened by years of holding his gun. Even the sight of it has you sighing, knowing he’s got you right where he wants you.

The air is thick around you as he slips his hand under the fabric, softly kneading at your inner thighs, only centimetres away from where you need him most. Your hips move without your go ahead, arching down in an attempt to get him closer. The movement doesn’t do anything to get him there, but it clearly causes him to take pity on you. 

A smile breaks out on his lips, and he kisses your jaw once before letting his fingers trail up to your core. You flush at the feeling of your wetness on his hand, but he lets out a soft groan, eyes trained down at the bulge of his hand under your shorts. 

“Oh, angel…” 

You can’t reply, shuddering breaths racking through your body as his fingers trace up and down your drooling slit. It’s overwhelming, the teasing glimpses of pleasure rolling over you until all you can perceive is him. 

“You know, sleep deprivation can lead to things like loss of libido. Your circadian rhythms are actually really important to keeping your sex drive steady.” 

His middle finger trails up, brushing soft touches against your clit, and you arch your back in response, a soft moan pulling itself from the back of your throat.

“It can be a bit of a vicious cycle, loss of sleep and loss of sex drive. But getting yourself back on track can help with both aspects of your life.”

He moves away from your clit, eliciting a whine that has him kissing your chin in apology. It’s quickly forgotten when the slick-covered digit is slipping into you, the sudden fullness making you squirm against the sheets. 

It’s slow, his finger thrusting lazily into you as you pant into the room. Your hands grapple for purchase in the sheets beneath you, your left brushing his free hand. Snatching it up, he helps you stay afloat as the heat bubbles up inside you.

“Arousal and orgasms induce release of the hormones dopamine and oxytocin. Dopamine is received at different receptors in your body, making you feel comfortable and happy. It’s strongly connected to our reward systems.”

His hand not currently occupied with you brings your hand up to his face, pressing a kiss to your palm as his thumb seeks out your clit, swiping over the sensitive point with practiced precision. It causes you to let out a low, keening moan that encourages him further, his voice gravelly as he continues to speak.

“Oxytocin is released into your bloodstream by the pituitary gland, and is linked with our feelings of love. It’s part of what binds us to our loved ones. It’s controlled by a positive feedback loop, so the more you feel pleasure from it and other stimulants, just like that, the more that’s released.” He pauses to watch you contort with rapture, hips bucking against him as he inserts another finger into you. 

You can’t see him, eyes screwed shut with pleasure, but you can imagine him well enough. 

His eyes are still hazy with sleepiness, but the glaze of adoration that settles over him whenever he has you like this is surely there too. His hair is messy, falling all over him, but you know he won’t do anything about it, too focused on the task at hand. 

“An orgasm will also lower your cortisol levels. That means that you’ll feel less stressed and preoccupied, which should help you sleep.”

You feel a little insane, his low voice sending you hurtling towards greater pleasure. It seems it doesn’t matter what he’s saying, whenever Spencer speaks to you like that, you can’t help but be putty in his hands. 

He falls silent now, kissing you once before fixing his intent gaze on you, and you know he’s determined to get you there. His thumb is perfectly synchronized with the two fingers still moving steadily in and out of you, a routine he’s perfected over countless moments just like this one. 

He knows steadiness is what gets you over that last hurdle. His hand never falters, the feeling of his calloused fingers dragging against the most intimate parts of your body causing you to puff out shallow gasps. You feel like you’re floating, the feelings so overwhelming that you barely register the feeling of the sheets rustling under your body. 

It keeps going, going, going until it happens. One final circle of his thumb against your clit and you fall apart, a cry of his name ringing out in the silence of the room. He doesn’t let up, fingers thrusting lazily in you until you’re whimpering, pushing his forearm with weak hands. 

Pulling his hand out of your shorts, he leans over to the nightstand, grabbing a tissue to clean his fingers. Once done, he settles back next to you, pulling the covers snugly under your chin and pulling you toward him. One of his arms lays under your neck, letting you nose into his side and exhale softly.

He’s saying something, voice velvety and comforting, but you can’t register any of it. The chemicals in your brain are swirling pleasantly, and you’re asleep before you can even think about it.