Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/900546.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Free!
  Relationship:
      Hazuki_Nagisa/Ryugazaki_Rei
  Character:
      Hazuki_Nagisa, Ryugazaki_Rei
  Additional Tags:
      Frottage, Doggy_Style
  Stats:
      Published: 2013-07-27 Words: 1762
****** A Lesson in Instinct ******
by scampadversary
Summary
     Although Rei has mastered butterfly, he still heavily relies on
     calculation and theory, so Nagisa decides to take further
     responsibility in teaching Rei how to be "free."
They took turns staying late with Rei that week. Every day had been a failure
so far. Day one, Nagisa. Then Makoto, Haruka, Nagisa, Makoto, Haruka. Each
person had spent two days of what seemed to be wasted effort on teaching Rei
how to at least move in the water. Nagisa volunteered the final day, laughing
it off by saying it was his responsibility, after all. Today was different
anyway. Rei had not only moved, but had also somehow mastered the hardest
stroke, butterfly.
“Wooow! You're amazing, Rei-chan. How did you do it?” Rei and Nagisa sat on the
bench overlooking the pool, worn out from practice. Just for that week their
club had managed to get special permission to stay later than normal. With the
sun setting, only Rei and Nagisa remained on the school grounds.
Rei puffed his chest out proudly and pushed his glasses up the bridge of his
nose.
“It’s quite simple. Like I said, butterfly was the only stroke I hadn’t tried
yet. Considering the muscles it requires and my physique from track, I…” he
started rambling about the technical details, though all of it sounded like
mathematical babble to Nagisa.
“So Rei-chan’s still stuck on numbers and equations, huh? I don’t get it at
all,” he muttered to himself. Rei paused and looked over, fixing his glasses
yet again.
“Did you say something?”
“Eh?” Nagisa let out a tiny giggle and closed his eyes. “Not much, really.”
“Oh, well then, anyway,” Rei proudly continued, “if you adjust the angle of
your arms at—“
“Rei-chan, you said you want to be free, right?”
“Hmm? That’s true, but…” Confused, Rei closed his mouth and glanced at Nagisa
again. This time his eyes were open and he stared straight at Rei with a slight
smile on his lips.
“You even did butterfly, but you’re thinking too much, you know? You still have
to work on being free.” Nagisa slid up to Rei, closing the distance between
them.
“Hey, want me to teach you?”
“What do you mea— uwa!!”
Nagisa tugged the side of Rei’s bathing suit just enough to hear a small snap
when he released it.
“Like… instinct.” He leaned over Rei and pulled off his glasses.
“H-hey!” Rei tried to grab them but missed. “A-anyway, I don’t at all get what
you mean!”
“Ohhh, really? But I’m sure you can feel your own face, Rei-chan.” A blush had
crept from Rei’s cheeks all the way to his ears. Nagisa tossed the spectacles
into the pool.
“Agh, I need those!”
“No you don’t.” Nagisa’s grin grew wider. “I told you already, you need a
lesson on in-stinct.” He stretched out the last two syllables in a soft voice
and moved suddenly, straddling Rei.
“You can see me a little better if I’m here, right?” Nagisa leaned his face in
and trailed his fingers up Rei’s thigh, stopping over his crotch.
“Ugh!” Rei tried to move away, but Nagisa threw his free hand around his
shoulders and held him fast.
“Well, your body seems to know instinct, at least,” Nagisa teased, grabbing
Rei’s bulge. Rei inhaled and a small moan escaped his lips. It hadn’t seemed
physically possible, but his face became an even darker shade of crimson and he
held the back of his hand up to his mouth.
Something wet slid across Rei’s hand, trying to force its way between his
fingers. He pulled it away from his mouth and Nagisa’s lips pressed against
his. The blonde's tongue slipped into Rei’s mouth before Rei had time to react.
Rei sharply inhaled, allowing Nagisa to push in farther. His tongue ran across
Rei’s teeth, beneath Rei’s tongue, along the roof of Rei’s mouth. He pulled
away. A line of drool caught the light of the setting sun and broke. Rei
quietly gasped for breath and abruptly moaned.
“Say, Rei-chan, it’s hard to teach when I’m the only one putting in any
effort,” Nagisa whined. He had pulled down the front of Rei’s trunks and held
his dick firmly in his hand.
“W-wait! Ahhhhh.”
“I meant it, you know.”
“Haaah?” Rei managed to exhale.
“That I thought you were beautiful. I know you can be even more beautiful, Rei-
chan. I want to hear your voice and see your face when you’re free. So, won’t
you let me?” He tightened his grip and felt Rei shiver beneath him.
Rei turned his head away before murmuring, “Fine.”
“Ahhh! I’m so happy! Hey, hey, Rei-chan, let’s move over there.” Nagisa leaped
off Rei’s lap and pointed towards the pool.
“You don’t mean… in the pool?!” Rei leaned backwards, flustered.
“Follow me. Don’t worry.” Nagisa grabbed Rei’s hand and led him to the linked
fence next to the pool. He gently pushed him forwards once they reached it.
“Why here?” He got his answer as he felt something hard press against him.
Nagisa had removed his swimming suit completely and was pushing his erection
against Rei’s thighs. The shorter boy let out a small sigh as his hands
gravitated back towards Rei’s dick.
With a grunt, Rei began to stumble forward and caught himself on the metal
links of the fence. He was in such an embarrassing position, his hips and ass
thrust slightly out, his back curved. Even with Rei bent over like this, Nagisa
couldn’t reach higher than his thighs. He began to rub himself against Rei,
panting. His hands moved too, caressing Rei, at first gentle, but slowly
harder.
The movements behind and in front overwhelmed Rei and his voice began to spill
out louder and louder. Nagisa’s moans joined his and his thrusting sped up as
he pushed his face into Rei’s back. Such soft hair… Rei couldn’t help but
tremble in excitement. Nagisa’s fingers provoked him, moving around the base of
his dick and teasing the tip, quicker, quicker.
Rei cried out and arched his back even more as the sweet feeling that had built
up in his hips was released all over Nagisa’s hand. Nagisa stopped moving and
sighed happily. Rei noticed a white liquid on the slender fingers that held him
moments ago and he gripped the fence harder, closing his eyes in humiliation.
Suddenly, cool air swept over him and he trembled. Nagisa had pulled his
swimming suit down to his ankles so his ass and legs were completely bare.
“Hey, what?!” Rei opened his eyes again and jerked his head towards Nagisa.
“… not yet. You’re still so embarrassed, Rei-chan. You can’t be free like
that.” Nagisa stood on his toes and nibbled Rei’s ear.
“Uh!”
“And it’s so unfair for just you to feel good, Rei-chan.”
Rei glared at nothing in particular, though his expression quickly melted into
something gentler, more sensual.
“You’re so tall,” Nagisa sang. “Can’t you lie down for me? Please?” Nagisa
lifted a foot up and lightly tapped the back of Rei’s leg. Rei bent down,
finding himself in an even more humiliating position, his ass fully out, his
elbows and knees pressed against the ground.
Rei let out a loud moan, forgetting himself as something wet entered him.
Nagisa was moving two of his cum-soaked fingers in Rei’s ass, twisting them
slowly and pushing, pushing, deeper, deeper. Rei groaned in pain.
“N-no… hurts. Ugh.” His protests gave way to low whimpering. Ecstasy replaced
pleading as Nagisa used his other hand to play with Rei’s nipples. He squeezed
and twisted. Pain and pleasure mingled and Rei felt like his world was becoming
shapeless, a burning white of instinct.
Nagisa’s fingers moved faster, opening Rei, scissoring, while his other hand
scratched everywhere lightly. His nails began at Rei’s collarbone, then teasing
the area around his nipple - he intentionally avoided that sensitive spot
except for one light brush. Rei whimpered, but then moaned as an intoxicating
pain reached his hipbones. Nagisa scratched there as well, leaving red marks.
He at last reached Rei’s again erect dick, making sure not to be too rough.
Rei gasped for air as Nagisa pulled his fingers out of Rei’s ass. For a moment
Rei panted while Nagisa caressed him.
Once more Rei felt two very different sensations mix as Nagisa’s hard dick
pressed inside of him, stretching him out. It hurt, but he was also becoming
numb. The feeling left him bewildered and he couldn’t process what was
happening. His second hand again free, Nagisa explored Rei’s body. While he
continued stroking Rei’s erection, his other hand fondled and pinched him. He
followed the line of Rei’s neck, then tracing along his chin before grabbing it
and twisting Rei’s head towards him.
They kissed, their tongues intertwining. The time, Rei found himself moving in
response, but not just to Nagisa’s lips. He moved his hips, trying to take more
of Nagisa in and trying to heighten the sweetness reaching his eyes and ears.
Saliva trailed down his chin as he gasped for air and let Nagisa push his
tongue into his mouth again.
Nagisa thrust harder and Rei suddenly lost control, his voice echoing through
the empty school grounds.
Nagisa repeated the thrust, aiming at that spot again, and Rei no longer
thought at all. He lost himself. He was lost in the flood of pleasure from his
hips, his ass, everywhere. Everything sweet and painful and pleasurable mingled
and he asked for more, more, more by moving his hips violently, by biting
Nagisa’s tongue, by moaning and moaning and moaning.
“Haaaaaa. Na… gisa-kun.” Nagisa answered by fucking Rei harder still, faster.
His mouth left Rei’s lips and found his neck instead, which he kissed, licked,
sucked.
“Ugh, I’m going to… again.” Rei's back curved and he pushed his ass against
Nagisa, coming for the second time, blinded by pleasure. Rei gasped for air as
the tension left his body and a calm sleepiness spread throughout him. Nagisa
was still inside. He had gotten much rougher and lusty sounds were flowing from
his mouth without end.
“Me too, Rei-chan.” Nagisa stopped, buried in Rei, and moved his hands to hold
Rei’s hips hard. A sticky wetness filled Rei and he felt Nagisa’s weight as he
collapsed onto Rei’s back, gasping. After a few minutes, Nagisa pulled out and
sat down. The thoughts that pleasure had chased away returned to Rei and he
looked down in shame.
Nagisa spoke, breaking the silence, “You were free, Rei-chan. I really think
so.” Rei averted his gaze.
“Really, Rei-chan, you were soooo beautiful!”
Burning up, Rei mumbled, “You were too.”
“Huh?”
“Nagisa-kun was beautiful…” he repeated.
Nagisa laughed and kissed Rei’s forehead. They stayed like that just a little
longer.
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