Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/1982448.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      F/M, Multi
  Fandom:
      Castle
  Relationship:
      Kate_Beckett/Richard_Castle, Kate_Beckett/_Richard_Castle/Original_Male
      Character
  Character:
      Kate_Beckett, Richard_Castle, Original_Male_Character
  Additional Tags:
      Castle_Kink_Meme, Slight_Incest, Slight_Parent/Child_Incest, Teenager,
      son_-_Freeform, Voyeurism, Kink_Meme, Caught_having_Sex
  Series:
      Part 9 of 2014_Castle_Summer_Kink_Meme
  Stats:
      Published: 2014-07-19 Words: 2602
****** Demonstrations ******
by OnceUponACaskett
Summary
     I marked underage just in case anyone wasn't okay with a 16 year old.
     Fill for the 2014 Summer Hiatus Kink Meme. Castle and Beckett's son
     catches them having sex and right after, Castle teaches his kid how
     to give a woman pleasure in bed.
Notes
     Prompt: Caskett's teenage son catches his parents having sex. When
     the boy is caught watching them, Castle gives his son advice and acts
     it out for him. Your choice if he then displays what he's learned.
     The archive warning says underage, but it's really not. The OC is 16
     years old, but I put the warning just in case anyone got too touchy
     about it.
James sighed and walked through the front door of his home. He was supposed to
have been at his friend’s house, studying for the big exam tomorrow, but his
so-called friend blew him off to go hang out with his girlfriend. It totally
sucked that he’d gone all the way to David’s house and then had to come back
almost immediately.
Hearing a strange noise to his right, the teen looked in that direction and
noticed the door to his dad’s office was ajar. Frowning, he cautiously walked
over to it and could hear even more muffled sounds. Pushing the door open,
James glanced around the small room and saw that it was empty. However, the
door to his parent’s bedroom was cracked and that’s exactly where the noises
were originating from.
“Castle,” he heard a woman’s voice gasp. “Fuck me harder!” And that wasn’t just
any woman’s voice; that was his mom.
Oh shit, my parents are totally having sex right now, the teen thought to
himself. His first instinct was to turn tail, hide in his room, and shove
earplugs in his ears. That thought, however, was gone just as fast as it had
come, replaced instead by another crazy idea. Quietly stepping towards the
bedroom door, James lightly pressed it farther open, just enough so that he
would be able to see the activities going on.
His parents were lying sideways across the bed, parallel to the headboard,
which was great for James because he could see everything. His dad drove
repeatedly into his mom while she moaned and writhed beneath him.
Castle swooped down and captured a nipple in his mouth, rolling his tongue
harshly over the small bud, his rhythm never faltering once.
James could feel his pants rapidly getting tighter and more constraining by the
minute. The sixteen-year-old knew that his parents weren’t exactly bad-looking;
they were actually quite attractive for their ages, a fact that his many
friends—both male and female—never seemed to let him forget. Bringing a hand
down to the front of his jeans, the boy cupped his growing erection and
squeezed lightly, biting his lip to hold back a groan that threatened to
escape.
He saw his mom wrap her long legs around his dad’s waist, limiting his
movement. Castle chose to grind his pelvis hard into Kate’s instead of
adjusting her grip on him. One of her hands fisted in the sheets as her head
tilted to the side. Her eyes widened when she saw her teenage son standing in
the light that was pouring in from the partially open door.
“Castle!” she said urgently. “Castle, stop!”
Her husband looked confused at her sudden change in mood. When he followed the
direction her eyes were staring in, he smirked.
“C’mere, son,” he said to James, gesturing for the boy to enter the room.
Complying, James stood awkwardly by the door, his eyes never leaving his
mother’s nude form.
It wasn’t that he’d never seen a naked girl before; he was a teenage boy after
all and had watched his fair share of porn. But he’d never seen a girl naked in
person and it was completely different from seeing one on the internet.
"Babe, what’re you doing?” Kate asked her husband.
“He’s obviously just curious,” Castle answered. “And besides, he’s sixteen and
I think it’s time I give him a few pointers on how to treat a woman in bed.
What d’you say, James? You wanna be able to impress the first girl you have sex
with?”
James nodded eagerly. A couple of his friends had already lost their
virginities and—in the confidentiality that is “the guy code”—they’d told him
that their girlfriends were less than impressed with their performances. They
either shot too soon or couldn’t give their girls an orgasm. James wanted to be
different. He wanted his first time to be different in that he wanted to give
the girl he was with a decent amount of pleasure. What better way than to gain
some knowledge and experience from his former-page six playboy dad?
Castle glanced down at his wife and asked, “You alright with this? If not, we
can just forget it.”
Kate sighed and smiled up at him. “Go ahead: do your thing, Castle.”
The writer grinned and then looked at his son. “And that brings us to rule
number one: always be courteous and aware of your partner’s wants and needs. If
she says no to something, you don’t push her into it or try to persuade her
otherwise. You drop it and move on.”
Pulling his cock out of his wife, Castle continued. “Now speaking of wants and
needs, James, you gotta make sure that you spend enough time on foreplay to
make her wet enough for you. If your mom and I had only just started this by
the time you got here, then it’d be easier to actually show you. Instead, I
want you to come over here by me.”
James moved to where Castle was. The older man put a hand to Kate’s pussy and
spread her so that his son could observe.
“You see what I mean? Your mom’s been this fucking wet because I spent time
kissing her neck, running my tongue over her breasts, sucking them into my
mouth.” To show what he meant, Castle bent over and latched onto one of her
breasts. His hand came up to fondle the other one, squeezing and rolling the
taut nipple between his fingers. He was rewarded with a loud moan, signifying
her approval.
Kissing down her stomach, feeling the muscles bunch and twitch underneath his
touch, he halted when he reached the apex of her thighs.
“Now this is something that not every girl is gonna want you to do. Going down
on someone can be seen as sometimes a more intimate act that the actual act of
having sex.” Castle could tell that his son was listening to every word he said
with rapt attention.
“One thing that you can and should always do, though, is fuck her with your
fingers.” He ran the tips of his fingers through her, delighting in how hot and
wet she was. “You should always check to see if she’s wet enough and ready for
you, no matter what. She’ll appreciate it if you do this, though.” Slamming two
fingers into Kate, he began a rough pace that had her hips bucking hard.
When Castle suddenly stopped and pulled out, his wife groaned and gave him a
sharp look.
“What the hell, Castle?” she snapped, annoyed at the loss of the pleasurable
feeling.
Ignoring her, he continued to address his son. “Unlike how I just started
fucking your mom like that, you should mostly go slow for the first few times
you’re with a girl. At least, until you learn what she does and doesn’t like.”
Pushing a single digit back into Kate’s entrance, he said, “Start with one
finger and after a little bit, add a second. Maybe even add a third if she can
take it.”
Castle slid another finger into his wife and curled the digits, making Kate’s
hips shoot off the mattress, her head toss back, and high-pitched whine escape
her throat.
“What the fuck was that?” James asked, so alarmed by his mother’s sudden and
enthusiastic reaction that he forgot to censor his words.
His dad grinned smugly at him. “That, my dear boy, was me hitting your mother’s
g-spot. Some women are highly sensitive in a certain area on the front wall of
their vagina and when you find it, it causes extreme amounts of pleasure for
them.” To demonstrate what he meant, Castle quickly pounded his fingers into
Kate, curling them with each stroke so that he struck her spot.
James watched in silent awe as his mother came very much alive under his
father’s touch. Her eyes slammed shut, her head tossed from side to side on the
bed while her mouth opened, her breathing turning into fast, hard panting. Her
hips wouldn’t stay still as she tried to ride his hand. The teen watched as his
dad placed an arm across her stomach to hold her down.
From his time spent watching porn, James could tell when someone was about to
have an orgasm—and his mom was about to have a giant one. The ache in his groin
was starting to get unbearable. Frankly, he didn’t know how he hadn’t dropped
his pants and come all over the floor yet.
Just when he thought his mom was about to come, he saw his dad remove his hand.
Fuck, Mom’s not gonna be happy about that, he told himself. Hell,Iwouldn’t be
happy about that and I’m not even a fucking girl.
“Now, James, if there’s one thing you need to know about a girl’s pussy, it’s
this little area right here.” Castle pointed to a small bud slightly protruding
from the top of Kate’s pussy. “That’s called a clit and every woman’s got one.
It’s literally full of nerve endings that make it really sensitive and you
shouldn’t ignore it. A lot of women can only come if rub her clit. Fuck her all
you like, but if her clit doesn’t get touched, then the odds of you giving her
an orgasm have just decreased greatly.”
Plunging his fingers back into her, he set a quick pace as his thumb worked to
circle his wife’s clit. Moving his free hand north, the writer grabbed her
breast and kneaded it softly, watching closely as Kate moaned his name, finally
being given the opportunity to come.
“Whoa,” James commented softly. Of course he’d seen the actors in his
pornography come, but watching someone in real life was even more amazing. The
pornstars would always exaggerate and overact to the point where some of it
wasn’t even really worth viewing. But this was raw and new and he enjoyed every
second of it.
"James.” His dad’s voice brought his attention back to him. Bright, blue eyes
were gazing sternly at him. “However unfair it may seem to you, I want you to
recognize that you are not entitled to anything when it comes to sex. If she
backs out and changes her mind, even after you did all this and you have a
raging hard-on, you never force her to ‘take care of it’. Do you understand
me?”
“Yeah, Dad,” the teen told him seriously. “That’s not what real men do.”
Castle smiled proudly at his son. “Exactly. Now,” he turned back to Kate who
was still lying on the bed, a bit dazed from her last orgasm. “When you get the
all clear from her, you can go ahead and actually have sex. Unless they tell
you otherwise, you should always try to go somewhat slow; give them time to
adjust.”
Even though he and Kate had been together for close to twenty years, Castle
wanted to show James precisely what he meant. Hovering over her, he lined
himself up and sank inch by inch into his wife’s warm, welcoming entrance. He
paused for a moment and said to James, “Feel free to move around and find a
better spot to observe.” Pulling out and then thrusting back in, Castle began a
leisure pace, keeping it slow for the time being.
Speaking to his son, he said, “Sometimes, this position isn't gonna do it for
her. A slight change in the angle can create more pleasure for her.” Grabbing
the backs of Kate’s knees, he brought her legs farther up, opening her wider
for him.
“Fuck, Castle!” she screamed when he brushed against her front wall.
“See?” he said, his tone dripping cockiness. Out of the corner of his eye, he
could see James struggling with himself. His hands were clenched into fists and
he was biting his lip in a way that reminded the writer of a certain detective
that was currently writhing beneath him. He saw the bulge in his son’s pants
and nearly laughed.
“Go ahead, James,” he told him. “Jack off—you shouldn’t be the only not getting
any satisfaction out of this.”
Now that he’d been given the okay to do it, James hastily undid his jeans,
shoving them and his boxers down his legs, and wrapped a hand around his
hardened shaft, twisting his wrist with every stroke.
“Everything,” his dad went on, “I taught you, you should apply here. Kissing
her neck,” his lips attacked her skin, nipping lightly and running his tongue
over the area to soothe the sting. “Showing her breasts some much needed
attention.” He trailed his mouth down to her chest, flicking the tip of his
tongue over the peak of one nipple.
His hips pistoned into her, never stopping as he drove his cock deeply into
her. He released one of her legs to bring his hand down to where they were
joined.
“Rubbing her clit,” he said to James, his voice a bit strained as he neared he
and Kate neared their climax together. He roughly circled her clit with the
pads of his fingers, feeling her clamp down around him.
“Castle!” she screamed, her nails raking down his back, leaving angry red lines
in their wake.
“God, Kate,” her husband grunted into her ear as he came, spilling himself
within her. He jerked his hips a couple more times before rolling off of her,
his head turning to the side just in time to see his son come all over his own
hand.
Gathering his strength, Castle got up from the bed and disappeared into the
bathroom, returning seconds later with damp washcloths. He tossed one to James
before moving to the bed.
As James wiped the stickiness from his hand and his cock, he watched with
interest as his dad knelt by his mom’s side and ran the washcloth gently
between her legs, cleaning her before he attended to himself.
He followed quietly behind his dad when the older man gestured to him, taking
them both into the bathroom. They stood at the sink in companionable silence,
rinsing out their washcloths. It was Castle that spoke first.
“One of the most important things that perhaps you should remember, James, is
to wait until you are ready. No matter what anyone else says or does, don’t let
yourself be pressured into doing something you’re not totally comfortable with.
You’re a smart kid and I have faith that you’ll know when you’re ready.”
James smiled up at him. While he had always been a mama’s boy ever since he was
a baby, his dad was someone whom he knew he could trust with anything and not
be unreasonable about it. His mother had a tendency to overreact when something
would happen to her precious baby boy.
“Now speaking of smart,” Castle segued, “you have an exam tomorrow that you
should’ve been at David’s house studying for. Since apparently that didn’t work
out, get crackin’.” He gave his son a light shove out the door.
“Thanks, Dad,” James told him sincerely. “But, uh…I think Mom might need
help…moving.”
Father and son glanced at the bed and saw Kate still lying in the exact same
position that Castle had left her in.
“Yeah, I should probably go help her.” Castle dashed over to the bed and helped
his exhausted wife shift onto a pillow and get under the covers.
Shaking his head, James went to his room. How the hell he was gonna be able to
focus on his textbook right now, he had no idea.
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