Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/1141236.
  Rating:
      Explicit
  Archive Warning:
      Choose_Not_To_Use_Archive_Warnings, Underage
  Category:
      F/M
  Fandom:
      Sherlock_(TV)
  Relationship:
      Sherlock_Holmes/John_Watson_(Joan_Watson)
  Character:
      Sherlock_Holmes, John_Watson_(Joan_Watson)
  Additional Tags:
      Teacher-Student_Relationship, Spanking, Daddy_Kink, Ephebophilia, Dirty
      Talk, Teacher_Sherlock, Student_Joan, Masturbation, Underage_girl_having
      sex_with_a_grown_man_basically, Female_John_Watson, OOC, Squirting,
      Female_Ejaculation, Pedophilia
  Stats:
      Published: 2014-01-18 Words: 3601
****** Naughty Girl ******
by perp
Summary
     Sherlock has a special relationship with one of his students. One
     day, he sees her purposefully flirting with another boy in his class.
     Someone's getting punished.
Notes
     Sherlock is 28 years old and Joan is 16, so this is a grown man doing
     sexual things with an underage girl who is participating willingly.
     If that's not your cup of tea, please don't read.
     I've never been to a school that wasn't in America, so this story may
     not fit how it is over in London. Also, this isn't beta'd, so any
     mistakes you might find are my own, and I apologize. There were some
     characters mentioned that aren't in the tags because they're barely
     in the story in the first place.
     Hope you enjoy!
See the end of the work for more notes
Sherlock sat down at his desk as the rest of the students filed into his
classroom. He opened the files on his computer and set them up for the
powerpoint he was going to give today. He wasn't a fan of being an English
teacher to put it mildly. He loathed this job. He was working here undercover
for a case all school year. Once this year was finished, he wouldn't have to
return. He'd begged Mycroft to get him a better subject to teach, like
Chemistry, but he got stuck with English. 
There was one little upside to being a teacher though, and she was walking into
the class right now.
Sherlock turned his head slightly, and looked up to her and smiled as she took
her seat at the front of the class. Joan Watson, don't you look wonderful
today, he thought to himself.
She was wearing her school uniform, a sweater with a dress shirt underneath, a
tie around her neck underneath her collar, and a skirt that went down to just
above her knees.
He knew it was wrong to think about girls her age the way he did, but she was
so different. He didn't even consider her a 16 year old. She was much more
mature than the other girls in her class. She had the brains, the wit, and even
the humor of an adult. She was actually a lot more interesting that the actual
adults he hung around. He also knew the fact that she was as mature as she was
didn't justify the things they'd done and will continue to do together, but it
just felt so right. 
Joan looked up from her bag after pulling out her notebook and a pencil, and
smiled at Sherlock. He nodded to her and stood up.
"Alright, class, today we're going to go back over the meanings of some of the
terms you've learned these past few lessons. Please take notes, there will be a
quiz on these next Monday."
He walked over to the smartboard and turned it on, displaying the powerpoint.
Then, he turned off the lights, and sat back down at his desk with the
smartboard remote in his hand.
His mouth went on autopilot as he clicked through the slides of the powerpoint,
saying everything written out loud and then giving his class time to write it
down. He hated these lessons the most. He had nothing to do but sit and click a
button.
He was brought out of his boredom when he heard a student giggling in the front
row. He turned his head and glared.
The student was a boy sitting next to Joan. 
"What's so funny," Sherlock asked him.
"Nothing, sir. Sorry," he stated nervously. 
Sherlock looked from the boy and then to Joan who was staring guiltily at him.
"No talking."
"Sorry, sir," both Joan and the boy said in unison.
The two focused back on their notes and jotted down what was on the current
slide. Sherlock would have to keep an eye on that boy. He didn't want to have
to give Joan a detention because of him.
He continued clicking and speaking and clicking and speaking. After a few
minutes, he turned back to Joan and the boy, not facing them completely, but
turning his head slightly so he could see them. She was smiling down at her
paper, it looked like she was reading something. She flipped the paper over and
wrote something else on it. Then, she leaned over beside her desk to get
something from her bag and "mistakenly" nudged the paper off her desk with her
elbow. She rummaged around in her bag for a moment, but pulled out nothing. 
The boy glanced at the note on the ground and covered it with his foot,
dragging it closer to him until he was able to lean over and pick it up. He
flipped it over to the side Joan had written on, and looked over to her and
winked. She smiled widely and winked back.
Before he could write anything else, the bell rang, and the students
automatically started packing up.
Sherlock was outraged. It looked like Joan was shamelessly flirting with that
boy. He had to see what was written on that paper. 
He stood up and turned on the lights as the students shuffled out of the room.
He was standing by the door when he spotted Joan and the boy giggling at each
other as they walked out together. Sherlock stopped them when they got to the
door, and everyone else left until it was just the three of them.
"I saw you two during class today. You both know the consequences for passing
notes during a lesson. If you don't want to be sent to detention, I suggest you
give me that note and be on your way. Joan, you stay. I'd like to have a word
with you."
Both the teens turned bright red and their eyes went wide. The boy turned to
Joan who just nodded, and he pulled out the note from his bag and handed it to
Sherlock.
"I'm very sorry, sir. It won't happen again," the boy said sheepishly before
rushing out of the room.
Sherlock closed the door behind the boy and turned to Joan.
"Sit down," he told her harshly and gestured to the desk in front of his.
She did as she was told, keeping her head down. She was so guilty.
Sherlock walked over to his desk and sat down, unfolding the note and reading
their secret conversation. The font was the boy's handwriting in black ink, and
the back was Joan's in red. They hadn't talked for very long it seemed, there
were only a couple lines of text.
The first from Joan: Hey, do you want to come over tonight?
The boy: I don't know if I can, my mom grounded me. Sometimes she forgets she's
grounded me though, so maybe.
Joan: If your mom forgets, will you come?
The boy: Yeah sure. But last time I came to your house all we did was sit and
watch that dumb movie.
Joan: MR. BEAN'S HOLIDAY IS NOT DUMB IT IS THE GREATEST SHUT UP
The boy: Woah woah okay lol, but what is there to do at your house?
Joan: Oh, I can think of plenty of things.
The boy: That sounds naughty ;)
Joan: Iamnaughty ;)
That must have been the part where they winked. Sherlock was a pure mess of
jealousy by the time he was finished reading. He shouldn't be affected by it,
it was simply two teens flirting. The boy hadn't even done much, it was mostly
Joan, but it still made him want to teach that boy a lesson when he was
finished teaching Joan who she belonged to. Thankfully he didn't have another
class for the rest of the day, so he had all the time in the world.
"How do you think this makes me feel, Joan," he asked her, breaking the
silence.
Joan looked up at him, not knowing what to say.
"Was it your intention to make me jealous?"
"N-no."
"No, what?"
Joan swallowed and looked back down at her desk. "No, Daddy."
Sherlock smirked at hearing the title. They hadn't done something like this in
weeks because they almost got caught last time. "Then what were you doing
flirting with this boy, hm?"
Joan shrugged, keeping her head down.
"I can sit here all day, young lady. I can keep you from getting to your
classes. You're already going to miss your next one. Answer me now and I won't
keep you as long."
Joan inhaled deeply and looked up shyly. "You haven't touched me in a while,
Daddy. I didn't want to risk you losing your job by asking you to play with me
again, so I thought I'd go to Mike."
His name was Mike. He filed that away in his Mind Palace for later.
Sherlock stood up from his chair, walked around the the font of his desk facing
Joan, and sat on the edge. 
"So, my little girl's been lonely," he asked.
Joan nodded.
"You just want to be touched is all, right?"
She looked up at him with big puppy dog eyes, slightly pouting her lips. "Yes,
Daddy."
"Oh, baby girl," he said with pity. "I'm so sorry I've neglected you."
He walked over to the door and locked it. "Unfortunately though, you've been a
very naughty girl. Instead of just coming to Daddy and telling him you miss
him, you had to go and make him jealous. Bad, bad girl. You know what happens
to bad girls, Joan?"
Joan shook her head innocently.
"They get punished."
 
                                     ■ ■ ■
 
Sherlock was sitting down in his chair again, Joan standing in front of him.
"Come here," he said, gently grabbing her wrist and maneuvering her so she was
laying across his lap.
"I'm going to punish you now, Joan. After this, I'll show you how much I've
missed you as well, but you have to be quiet for Daddy so this can go faster.
Okay?"
Joan nodded.
"Good girl."
Sherlock rubbed his hand over the backs of her bare thighs and trailed all the
way up to the hem of her skirt. He pulled the fabric over her back so he could
see her red lace panties.
"Oooh, Joan. You're a very naughty girl indeed," he moaned.
He tugged her underwear down so it was around her thighs and rubbed her bare
ass.
"Such a soft little girl, aren't you?"
Joan made a small moan in response.
Sherlock slapped her ass harshly. "Answer me."
Joan whimpered. "Y-yes, Daddy."
"Good girl."
He rubbed her cheeks some more to prepare them for the blows they were about to
take. When he felt she was ready, he began her punishment.
Each hit made her whimper. She loved it when Daddy spanked her. She knew he did
too, because she could feel his cock hardening beneath her. 
The sound of his hand making contact with her skin filled the room. She
wondered if anyone outside the classroom could hear.
"I want you to count these last ten for me, sweetheart," Sherlock said.
She moaned quietly when he hit her again. "One, Daddy." 
Another. "Uhnnn... Two."
Another. "Three, Daddy."
A particularly harsh slap. Joan couldn't hold back her moan. "Oooh my god,
four."
Sherlock smirked and hit her again, staring down at her reddening ass. "Five."
"Fuck. Six, Daddy."
Sherlock groaned. He loved to hear that innocent little voice swear. He landed
another swat on her soft cheek. "Seven."
Her voice was getting higher in pitch with her moans. "Eight."
"Nine, Daddy, oh god."
"Ten," she gasped.
Sherlock chuckled and rubbed her abused ass. "All done, baby," he soothed.
Joan was shaking. She sighed in relief as he moved her again so she was
straddling his lap, facing him, both her legs on either side of his thighs. He
had to remove her panties completely so she was comfortable.
"Have you learned your lesson? Are you ready to be a good girl now," Sherlock
asked.
"Yes, Daddy. I'm sorry."
"I know baby. It's okay."
Sherlock placed a palm on her thigh and another on the side of her cheek and
pulled her into a kiss. Their tongues played with each other, swapping spit.
The palm on her thigh began rubbing in little circles, going underneath her
skirt towards her hip.
He broke away, staying close to her lips. "Hey, baby?"
"Yes, Daddy?"
"Do you touch yourself when you're alone?"
Joan paused, almost embarrassed by the question.
"I-I do... sometimes."
"You do? Where do you like it the most?"
Joan shyly lifted up her skirt and showed him. "Here." She rubbed her clit.
"You like to rub yourself, huh? Daddy likes to rub himself too."
Joan gasped. "You masturbate, Daddy?"
Sherlock chuckled. "Pretty much everyone does, baby. I love to stroke my cock
when I'm alone. You want to see?"
Joan nodded eagerly.
Sherlock unzipped himself and pulled his hard member out of his clothes. 
"I usually use lubrication when I do this, but I don't have any with me. Will
you spit on my hand for me, sweetheart?" He put out his palm in front of her
lips.
She obediently spit on his hand and he brought it down to wrap around his dick.
He smoothed it over the head and down the shaft, covering his entire cock in
her saliva. 
"Mmmm yeah," he groaned.
"Does that feel good, Daddy?"
He licked his lips. "Yes it does, baby. It feels so good." He began quickly
pumping his fist up and down. "I like to sit in here when no one else is around
and think about you on my lap, bouncing up and down on me like the good girl
you are."
"You think about me when you touch yourself?"
"I do, baby. I can't get you out of my head. When I see you in class, all I
want to do is bend you over my desk and fuck you in front of everyone else so
they'll know who you belong to."
Joan blushed. She stared down at his hand, watching it work on his cock.
"You want to touch it, sweetie?"
Joan nodded and bit her lip. "Yes please, Daddy."
He took her hand and showed her how to grasp it. He guided her hand up and down
until she had a steady pace going, and he let go. He put both his hands on her
thighs and watched.
"You're such a good girl for Daddy. You make me feel so good."
"I like making you feel good, Daddy," she said, still staring at his dick. She
loved the way it felt in her hands. It was firm, and she could feel it
twitching every so often. It was practically pulsing in her grip, and it made
her so wet.
She continued pumping him until he was making groaning noises. 
"Baby, stop," he said quickly.
She pulled her hand away like she'd been burned with scolding water. "What? Did
I do something wrong? I'm so sorry, Daddy." She started panicking.
"No no, baby, it's okay. Daddy was just about to come is all. I don't want to
ruin your pretty uniform."
Joan's face turned redder, not only from embarrassment from overreacting, but
from the thought of having Daddy's come all over her sweater. 
Sherlock watched her face change shades and smirked. He moved his hand slowly
up her thigh until he reached her pelvis. He trailed his fingers up towards her
stomach and started rubbing her belly under her sweater. Then, he took his
other hand and moved it between her thighs, running a finger through her folds.
Joan's mouth formed a slight 'o' as he continued rubbing her lower stomach and
her pussy. His thumb began caressing her clit. Joan bit her lip and moaned.
"You're so wet for me, baby. You like that?"
She nodded. She didn't trust her voice to speak.
Sherlock stroked up and down her labia and stopped at her leaking hole. He
pressed a finger inside and rubbed along her walls. He pumped his finger in and
out of her, listening to her breathing deeply as she tried to control herself.
"Oh my gosh, Daddy," she moaned.
He grabbed her hip with the hand that was on her belly and added another finger
to her hole. Joan bucked her hips slightly, but she didn't grimace in pain like
she had the other times they'd done this. When he took her virginity so long
ago, he felt a little guilty, but now he was glad, because he didn't have to
take so long preparing her.
He kept pumping his fingers inside her until he felt her squeeze him hard. 
"Mmmm. Are you ready for Daddy's cock now, dear?"
Joan bucked her hips some more and nodded eagerly.
Sherlock pulled his fingers from her and brought them to her lips.
"Open," he commanded.
She did so, and he pushed his wet fingers between her lips. He felt her sucking
him, tasting herself.
"How do you taste, sweetheart?"
She hummed around his fingers and closed her eyes. "Mmmm," was her only
response.
When she was finished, he pulled his hand away from her and gripped the base of
his dick.
"Lift up a bit," he said.
Her thighs flexed as she hovered over his hard member. "Down. Slowly," he said
softly.
She lowered herself carefully, being guided by Sherlock's hand on her hip. She
felt the tip at her entrance and whined. She wanted to slam herself down on
him, but she knew she would only hurt herself that way. 
She kept getting lower until the head breached her hole. She didn't stop
though, she continued lowering herself slowly down his shaft. Her mouth hung
open as Sherlock let go of the base, and she slid the rest of the way down. He
pressed his hand against her back and panted with her, waiting for her to
adjust before allowing her to continue. He knew she was a very eager girl, but
he didn't want her to get carried away.
Sherlock closed his eyes when he felt her squeezing him, which was her
indication that she was ready. He groaned as she lifted herself until only the
tip was inside, then pushed back down on him. She moved her hips back and forth
on his lap, grinding his cock around against her walls. Joan's hands grasped
Sherlock's shoulders and she threw her head back.
His hands ventured up her shirt and under her bra, cupping her breasts. He
squeezed and massaged them while he watched her face as she bit back her moans.
"You like fucking yourself on Daddy's cock, baby?" Sherlock was panting.
"Fuck yeah, Daddy," she breathed.
"Tell me."
"I love fucking myself on your big, fat cock, Daddy. It makes me feel so
naughty."
Sherlock groaned. "You are naughty, aren't you? Such a dirty little slut for
Daddy..."
Joan picked up her pace, humping his lap in earnest. She loved the way his
pelvis rubbed her clit with every thrust.
"Your pussy's so tight, baby. Are you getting close?"
"Yeah," she moaned.
He moved a hand behind her and lifted her skirt. He trailed his fingers down
her back until her reached her ass. Her pressed a finger to her unoccupied hole
and circled it. He rubbed his finger further down to catch some of her wetness
and went back to playing with her ass. He slowly pressed his finger inside
which pulled a moan from Joan. She relaxed herself for him as he pushed his
finger all the way in until it was completely engulfed by her body. He could
feel his own cock moving around in her pussy as she continued to fuck herself
on him.
"Oh god, Daddy. That feels so good."
Her movements got quicker and quicker and he began pumping his finger in and
out of her ass. 
"Yes, Daddy, yes...Keep going. I'm getting close," she warned.
He increased his pace, fucking her with his finger. 
"That's it baby," he groaned in her ear. "Come on Daddy's cock."
She brought a hand to her mouth as it became harder to control her moaning. Her
hips bucked as she got closer and closer to the edge.
"Come on, baby. Come on..."
Without warning, she took her hand off her mouth and roughly gripped his
shoulders as she lifted off his cock and came all over him. She squirted a
steady stream of her juices on his cock, pants, shirt, and a bit of the chair
and floor. Her body convulsed and she went limp on top of him, breathing
harshly and moaning weakly. She rested her head on his shoulder in the crook of
his neck, and her arms hung off the sides of the chair.
Sherlock's mouth was wide open. She's never done that before, he thought.
Quickly, before the moment passed, he reached underneath her, grabbed his cock,
and shoved it back inside her. She groaned but didn't protest. 
He started fucking her roughly. The sight of her losing herself and coming all
over him made his cock twitch uncontrollably. He put his hands under her ass
and lifted her slightly. He pumped his cock up inside her hard and the sound of
skin slapping skin quickly filled the room.
He was getting close, his breathing getting labored.
"Yes, Daddy. Come," Joan tiredly moaned in his ear, still trying to catch her
breath from her own orgasm.
Her groaned and rode her even harder. His balls were drawing up and he could
feel himself getting closer to climax. 
"Oh god, baby... oh... SHIT," he groaned loud as he lost it.
He quickly pulled himself out of her and pumped himself a few times before
exploding all over her ass. His arms gave out and Joan plopped back down onto
his lap. She reached down and positioned Sherlock's still twitching cock so
that it was between her folds, and she began slowly humping his length. 
"Fuck... fuck... fuck...," he moaned. His orgasm seemed to last forever.
Joan hummed in his ear. She moved her arms so she was hugging his shoulders.
"Good, Daddy."
Sherlock closed his eyes and inhaled deeply. He could stay like this forever.
He was going to miss Joan when he left next year.
"You're beautiful, baby," he whispered in her ear.
She lifted her head slightly and kissed him on the cheek. "Thank you, Daddy."
Then, the bell rang.
End Notes
     *sits and waits for comments for years until finally one day I'm old
     as balls and someone's like "hey that was kinda hot I have the
     weirdest boner" and I'm like "yea same" then I die happily but my
     ghost doesn't go to heaven because I feel like I have unfinished
     business so I stay an old woman ghost and I haunt my own computer so
     I can continue to post really kinky fanfics until one day I go too
     far and post something about Sherlock turning into a germ and worming
     his way up John's buttcrack and giving him an orgasm as a germ and
     when John comes his butthole spasms and Sherlock's like "ayy lmao"
     wow I think I'll write that brb*
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