If the name 'kinktober' didn't spoil it, this is purely smut. You have been warned.
Sherlock as a Daddy!Dom, brought to you by @GraceHilton
Because if I have to write the sin, I'm bringing the suggesters down with me.

You weren't expecting for Sherlock to be in such a mood when he got home. It wasn't something that happened enough to you begin to understand a pattern to it, or find any sort of reason for it, but when it came, you were happy to play along.
The slammed door had been the first hint. You'd just been drinking your a fresh cuppa, and the next moment the entire flat had shook with the force of it. You had barely enough time to turn around when he pinned you to the counter, causing your still warm cup of tea to splash across his chest. Your eyes widened, and a blush swam to your cheeks. You couldn't look Sherlock in the eye for a few minutes, staring at his now-stained shirt.
"How clumsy of you, little girl," He growled, grabbing your wrist, "I'm going to have to punish you for such disarray, you understand that, right?" His voice sent shivers down your spine, but not necessarily in a bad way. You managed a feeble nod in response, voice refusing to work.
"Use your words, pathetic brat." His teeth nipped at your ear, a squeal leaving your lips not a moment after.
"I-I understand, Daddy..." You replied with an unstable cry. You could feel his lips curl into a smirk against your skin.
"Good girl. Now, I'm going to count to ten, and when I finish, I want you undressed and waiting patiently for your Daddy like a good little girl." He took a step back, a dark shadow taking over his normally bright sea foam eyes.
"One. Two..." After nodding hurriedly, you ran to the bedroom, forcing off your skirt and dress shirt before you even had time to think. If you were going to say 'no' this would be the time, but why would you? Your breath was weighed down by tiredness and excitement in a way that was inexplainable, and you could feel the quiver in your legs as your mind tried to wrap around what about this little act was so alluring to you.
"7...8..." His voice drifted towards the room, his steps echoing through the hall as you tried futilely to undo the clip of your brassiere, "9...10." He opened the door, brow rising, but no other response evident.
"I-I'm Sorry, I was try—"
"Did I give you permission to speak?" Before you could register it, your fingers had closed over your lips. You shook your head, trembling from the frosty chill of the air.
"I was inclined to keep your punishment relatively small since you were willing to behave, but clearly that isn't the case." He strolled over to his wardrobe, dexterous fingers quickly finding what he was looking for.
"What's our rule?" He questioned firmly, sliding the thick leather strap through his fingers, your breath hitching at the sight.
"Never disobey Daddy..." Your legs came up slightly, bottom lip slipping out into a pout.
"And what did you do?" Sherlock's approach wasn't unexpected, but it was intimidating, his shadow looming over you. He gave a new definition to the phrase "large and in charge".
"I-I disobeyed," You admitted softly, pressing your hands out as he extended out his hand. He pressed a kiss to each wrist before binding them together with the belt.
"You know I don't like to punish my little girl," He murmured softly, so softly that you could almost believe him, "But you don't give me a choice, do you?" He tilted your chin upwards so you had to look at him.
"No...I don't. I'm sorry, Daddy." His lips twitched as he tried to hold back a smirk, but he didn't have to for long, as he sat down and pulled you across his lap.
"You know the drill; count it or it doesn't count. You've misbehaved twice, therefore you have ten. Now, what's the safe word?" His fingers rolled through your hair, tenderly and reassuringly. No matter what state he was in, you would always be his top priority.
"Labeling Theory." You replied, taking a steadying breath as you relaxed into his touch. He nodded once to confirm, quickly slipping his hand along your back, and pushing your panties down to your thighs. The first one you were prepared for, calling the number out with the strike; the second was a lot less expected. He barely gave you time to straighten your thoughts out before it came, and you were lucky he counted the strangled version of the word 'two'. Six more came in rapid succession, with your face as red as your bottom as you squirmed against his bulge. Your own wetness was dripping along the inside of your legs, there was no way he couldn't see it.
"Nnngh-ine!" You fought through the word, legs pressing desperately together in an attempt to create the friction you were craving. The last strike made you moan wantonly, falling too low down on your bum to be anything but on purpose. Still, you managed to make out your last count, and he pulled you up by your wrists, forcing you to straddle his thigh.
"How utterly naughty you are, practically getting off on your punishment." He emphasized his point by pinching your still-red arse check, causing you to ride forward on his leg. The sounds you made were less than pure, to say the least.
All he did was smirk, "Get on your knees. You've had your fun, now it's my turn." His fingers twisted into your hair, tugging at it as you dropped down. You'd hardly say you'd even came close to getting off, but that wasn't the point. Actually, the opposite of it.
Your fingers undid his fly in a smooth and practiced motion, pulling him out obediently. He was harder than you'd expected, and you could feel your chest swell pridefully because of it. When he'd decided you'd taken too long, he tugged you forward, giving a low thrum of encouragement. You didn't need any more prompting, you slid your lips around his swelling cock, rolling your tongue along his shaft. A low moan fell from his lips, his hips bucking eagerly into your mouth.
"Go on; you know what to do," He prompted, letting his head fall slightly back in bliss. You pulled back, letting the tip of your tongue press slightly on his foreskin and lap around to his slit as you came off. Before he could complain, you pressed back down, letting him sit in the back of your throat. Vulgar curses were coming frequently enough to motivate you to take things a step further as you swallowed him down, not quite choking on his cock. He only lasted a few more rounds of this methodical pattern before he forced you down, dark pubes brushing against your skin as he spilled into your mouth. You pulled off as his grip loosened, cum dripping down your chin as you did. His eyes were hooded as he pulled you back up onto his lap, kissing you fierce and possessively.
"You'd never let anyone else do this to you, right?" He hummed, thumb slipping below your lip to wipe off your chin.
"Of course not; I only want you." You affirmed, letting the digit slip past your lips almost shyly, despite what just happened.
He smirked proudly, "Good," He easily flipped you onto your back, "I think you've earned a reward, don't you?"