Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/11193162.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      F/M
  Fandom:
      月刊少女野崎くん_|_Gekkan_Shoujo_Nozaki-kun
  Relationship:
      Seo_Yuzuki/Wakamatsu_Hirotaka
  Character:
      Seo_Yuzuki, Wakamatsu_Hirotaka
  Additional Tags:
      Sexual_Content, Smut, Plot_What_Plot/Porn_Without_Plot, Light_BDSM, Light
      Bondage, Oral_Sex, Anal_Fingering, Woman_on_Top, Orgasm_Delay/Denial,
      unprotected_sex
  Stats:
      Published: 2017-06-13 Words: 2644
****** The Mermaid's Prey ******
by missbiopotato
Summary
     A dark shadow appeared behind a wooden crate, and taking him by the
     arms dragged him deeper into the room.
     The motion reminded vaguely of a siren dragging her prey deep into
     the darkness, eager to eat him completely…
Wakamatsu was walking down the school corridor, ready to go home. Gentle and
soft-hearted as he was, he offered to help his fellow basketball players who
were on cleaning duties after practice. One by one, they started to leave,
making absurd excuses, until at last Waka was cleaning all alone, taking him
more time to clean than usual. But he didn't mind in the least; he liked
helping others. His only regret was that he didn't get to see the Choir Club's
Lorelei, or rather hear her, because he just couldn't bring himself to enter
the room and see her.
Ah, soft, beautiful Lorelei!
He'd never seen her, but her voice was so soothing and pure he was sure she was
the most pretty and innocent girl on Earth. She might even be an angel, Waka
thought, dreaming eyes and smile softening his facial features.
Nobody could deny it, he was in love. Completely, absolutely in love. He was so
love-struck that he'd never imagine that the Lorelei could be somebody he
actually knew well. Someone he dreaded, in fact…
Waka thought of how good his week had been while he walked back from the
showers on his way home. He hadn't seen Seo-senpai in a while, so he'd been
sleeping rather well at night. He didn't know why the older girl seemed to
annoy only him. 'What could be her purpose?' Waka wondered while walking a long
corridor, passing by an open storage room. A clattering noise soon was heard,
and Waka backtracked his step to look into the dark room. However, he could see
no one.
"Anybody there?" Waka asked, taking a few steps into the room.
Nobody answered, and so Waka backed slowly away, scared that it might be a
ghost or some awful mystic creature. However, before he was completely out of
the room, he heard a beautiful voice, singing softly. Before he could say
anything, he fell ungracefully on the floor, face down, soundly asleep. A dark
shadow appeared behind a wooden crate, and taking him by the arms dragged him
deeper into the room. 
The motion reminded vaguely of a siren dragging her prey deep into the
darkness, eager to eat him completely…
                                      oOo
Waka woke up, opening his eyes to complete blackness. His arms were tied above
his head, attached to something that would not let him move. He struggled to
get up, only to fail miserably; he was trapped.
"Help! Somebody help―"
A laughter erupted into the dark storage room, goose bumps chilling his body.
"There's nobody in the school; nobody excepted you and me…"
Waka froze; he knew that voice. It was a voice that gave him nightmares: Seo's!
"What's going on Seo-senpai? Why did you tie me? Why did you―"
A finger on his lips interrupted him. He still couldn't see her; his eyes had
not yet adapted to the dark, but it seemed that Seo-senpai had enough time to
get used to the darkness before he woke up. A sensual whisper tickled his ear,
hot breath blowing on his neck:
"Shush, Waka. Be a good kid and obey me. You're mine now…"
With that statement, she licked his ear, a slow, sensual movement that made
Waka shiver at the sensation. He tried to get away, but his bonds prevented him
from moving too much. She sucked on his lobe, softly biting the tender flesh.
Before he could stop it, a moan escaped his lips, making Seo grin wickedly.
"Got a sweet spot there, eh?"
She moved down to his neck, licking his jaw before kissing his throat, feeling
his accelerating pulse with her tongue. She marked his neck with love bites,
sucking and nibbling the tender flesh.
"Seo-senpai! Stop it! Pleaaaase―"
His plea went a higher note as she bit a particularly sensitive spot. Waka's
hips bucked up, hitting Seo's, who then started to grind slowly against his
quite impressive erection.
"Getting a bit excited down there, aren't you? Really want me to stop?"
Waka didn't answer, deep breaths escaping his mouth as he tried to calm
himself. It was Seo-senpai, for God's sake! He couldn't possibly do something
like that with her! But no matter how much his mind wanted him to stop, his
body wouldn't listen to him, instead continuing to grind against Seo-senpai,
who was by then starting to moan into the crook of his neck.
"Ah Waka!"
She bit him hard on the shoulder, which made him cry out in painful pleasure.
Wanting to hear more of his erotic sounds, Seo yanked his shirt over his head,
and lowering her head, took a nipple into her mouth, sucking and licking it
while trailing her hand down his chest and stomach. She grabbed the erected
pebble between her teeth and slid her fingers to his pelvis, lightly touching
his hard bulge with her fingertips. She shifted her head to the other side of
his chest, taking the other nipple into her hot mouth, and suddenly squeezed
his shaft with her small hand. The different amount of pressure made him cry
out and jerk into her hand, causing her to chuckle.
Oh, did she like it when he was under her control like that. Sadly, because of
the darkness, she couldn’t see his face, but she knew his eyes were shut closed
and his face must be contorted into a pained expression. She especially liked
it when he was whimpering, trying to swallow back the moans and cries that
threatened to escape his mouth.
She parted from him, lifting her upper body from his and sat on his lap,
careful not to make any contact with his bulge.
"Poor dog… Aren't you suffering? Want me to relieve you?"
Thinking she meant letting him go, he nodded vigorously. Unfortunately, Seo
meant something entirely different, and she would not let him free until she
had accomplished her mission: make him drown… in pleasure.
She lifted her hands toward the cords attached to his wrists, as if she was
going to release him; however, she pushed his shirt further down his arm, tying
a knot in it to reinforce his binding.
"B-but I thought you said…" he whimpered, his voice a little rough and throaty.
"That I'd give you relief? Yeah, that's exactly what I'm doing."
She unbuttoned his pants, sliding down the zipper painfully slowly, making sure
he felt every tooth opening as his shaft tried to spring free from its confine.
When she finally finished her torture, she leaned toward him and whispered
hotly into his sensitive ear:
"Up."
He obeyed without thinking about it, lifting his bottom as she slid his pants
and underwear to his knees. His fully erected dick sprang toward the ceiling,
and he sighed at the sensation of freedom around his shaft. It had been
painfully tight in his pants since he was quite big; free from its confine, it
stood proudly, throbbing for attention.
"Mmm, you're quite big aren't you, Waka? Quite hard too. So would you like a
hand to help you with that? Or maybe a mouth…?" 
Without waiting for an answer, she lowered her face and give a long, slow lick
on the tip of his penis. Taka shuddered at the wet touch, his overly excited
neurons feeling every bit of her tongue on him. She placed a hand on the base
of his dick, the other massaging his inner tight, and she slowly push him into
her mouth, her tongue stroking the underside of his penis as she took the most
of his flesh that she could between her lips. Then she pulled out as slowly,
pausing to lick his head and sliding her tongue in the slit, tasting the bitter
yet so sweet precum that was escaping from his excited member. She took him
completely again, this time a little faster, and repeated the process until she
was going at a pretty steady rhythm. His panting was becoming more and more
harsh, whimpers and groans escaping his throat and mouth.
Seo decided to experiment, see what would break him the fastest. She sucked him
as she would on a straw, trying to drink every last drop of his pre-ejaculate
fluid. Waka gasped loudly, the pressure of the suction on his shaft sending a
wave of pleasure through his body.
His reaction was good, but she would need to do more if she wanted to make him
squirm under her. 
So she tried with her teeth next. She narrowed the circle she had formed with
her mouth, scratching lightly against his sensitive flesh. After only one
length, he was screaming in pleasure, head thrown back as his hips bucked up a
bit between her lips.
Hohoho, found something interesting!
Seo grounded herself more firmly in his lap, trying to steady his hips so she
would not choke on his thrusts. She bobbed her head more quickly around his
shaft, and brought the hand that was on his tight to his sack. She massaged him
roughly, juggling his testicles between her fingers. She moaned as she felt him
whimpering and squirming under her, the vibrations from her throat adding to
the euphemistic pleasure that shot across his body. It only took a few more
pumps before he was almost sobbing, a hair away from tipping over the edge.
However, sensing the arrival of his climax, she pulled quickly away and
squeezed his shaft hard, preventing him from coming.
"Hm-nm, I'm not done with you yet…"
She would have loved to see his expression, teary eyes and opened mouth, cheeks
flustered and forehead covered in sweat. He made the most pitiful noise she
ever heard, almost sounding like a wounded animal. How she liked that sound.
"Hmm, I wonder what I should to next…" she chimed, one hand still gripping his
cock as the other trailed down his body.
Should I take him inside me? But then the fun won't last much longer…
A wicked grin contorted her face as she thought of her next move. Her fingers
trailed down his stomach, glided beside his shaft, slid down his scrotum, and
finally came to a rest on his tight hole. She circled the tense opening,
feeling it shudder against her fingers.
"W-what―what are you doing?" Waka stuttered, shifting uncomfortably under her.
"Hmm, I wonder? What does it seem like I'm doing?" she asked teasingly,
pressing a bit harder against his hole.
He didn't say anything, only quick puffs of air leaving his mouth.
"Answer me Waka. What I am doing?" she insisted, squeezing his shaft more to
force an answer out of him.
"You… You're… You're going to… to… finger me…"
"Good boy!" 
"B-but… But you can't do that! It's… It's filthy!"
"You just took your shower, Waka. It shouldn't be filthy. But you're quite
filthy, Waka. Such a dirty, smutty body…" she said as her thumb spread a drop
of pre-cum that had formed at the tip of his thick penis.
"Now, you need to relax if you want it to feel good. Or perhaps not, if you
want it to hurt, since you're such a masochist…" she whispered into his ear,
pressing a finger into his tight hole.
He shuddered as Seo penetrated him to the first knuckle, voicing pained moans
at the unfamiliar feeling.
It needs lube,she thought as her fingers pushed harshly into him. But I don't
have any…
Suddenly thinking of something, she pulled out of him, and lifted her bottom
from Waka's lap. He looked up at her curiously as she got to her feet, only
seeing her shadowed silhouette in the darkness. He heard her shuffle quickly
with something that sounded like fabric, step out of the garment, and then she
moaned loudly as a wet and slicked noise came from her direction. Then her
fingers quickly returned to his ass, now slimy with what he suspected was her
own juice. He twitched as she easily slid a finger inside him, carefully
stretching him. Then she added another slick finger, causing his hips to buck
at the surprising amount of pleasure he felt when she fingered him.
"Do you like it, Waka? Want me to add another one?" she asked, pumping faster
into his widening hole.
He moaned loudly as a third finger entered him, curving inside him and stroking
sweet spots he didn't know he possessed. Soon enough he was a panting mess, his
over-stimulated cock twitching and throbbing under her firm grip, begging for
relief.
"P-please, Seo-senpai…! I need… I need to…" he plead between painful moans. He
needed to come so much it was hurting him.
"Not yet, Waka." she said as she took her fingers out of his sensitive hole. He
moaned at the lost, but then her fingers were on his cock, spreading the rest
of her juices on his erection. She waited a bit for him to calm down a little;
after all, she didn't want him to finish too soon.
Seo climbed on top of his hips, positioning her wet entrance on top of his
thick shaft. They both moaned as the head entered her, stretching her walls as
she lowered herself slowly on him. Hotness and wetness covered his twitching
member, and his hips bucked up a bit as he thought that he was inside her,
inside Seo-senpai. She was tight around him, sucking his cock deeper into her
core as she took him completely.
"Oh God, you're so big, Waka… So good…"
She pulled out of him, keeping the painfully slow pace as she pumped him back
inside her, until he was pounding jerkily into her, trying to go faster.
"Hmm, want more, Waka?"
He moaned his approval, and she quickened the pace until he was slamming into
her, his hips moving frantically as he tried to follow hers. She slightly
changed the angle, and he was rubbing against a sweet spot, sending waves of
pleasure through her entire body. She sensed her orgasm arriving, and crying
out she continued to ride him as her walls clenched around his twitching cock,
spasms overtaking her body.
"I'm… I'm gonna…" he tried to say, feeling his orgasm coming too.
She pulled out of him as he came painfully hard on his stomach, loads of white
semen covering his well-defined abs. He felt his body grow limp as he recovered
from the over-bearing sensations Seo-senpai just gave to him. He heard her sing
a lullaby, and he slowly drifted into sleep…
                                      oOo
Waka woke up lying on the hard floor of the dark storage room. Sitting up, he
thought confusedly at what just happened.
Was it a dream?
He was fully clothed, his shirt even tucked in his pants. I should be full of
sweat and cum,he thought embarrassed, however he was wiped cleaned, only his
damp underwear and the musky smell in the room indicating that something sexual
happened there. He also felt blissful, the kind of sensation he knew he had
after he got his load off.
Did I masturbate at school?he thought, heat filling his cheeks as he got on his
feet.
Oh!
An uncomfortable sensation in his bum made him wink. It definitely wasn't a
dream, that was for sure. And if he did masturbate, he would still be sticky
with cum.
Did Seo-senpai really did that with me?
Wondering what really happened, he walked like a penguin to the door, the
muscles in his ass still twitching a bit when he moved around. He found his bag
beside the door, and verifying that no-one was coming down the hallway, quickly
shuffled toward the school exit. He wondered how he should face Seo-senpai
after today… Was it a one-time thing, or would it happen often? Blushing as he
thought of doing that sort of thing frequently with Seo-senpai, he scurried out
of the school, wondering when would be the next time.
 
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