Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/8519074.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      F/M
  Fandom:
      Fire_Emblem:_Kakusei_|_Fire_Emblem:_Awakening
  Relationship:
      Chrom/Female_My_Unit_|_Avatar
  Character:
      Chrom_(Fire_Emblem), Female_My_Unit_|_Avatar
  Additional Tags:
      Smut, Hogwarts_AU, Sexual_Humor, Library_Sex
  Stats:
      Published: 2016-11-10 Words: 1236
****** Golpalott's Third Law ******
by newmrsdewinter
Summary
     Hogwarts AU: The look on Robin's face told him that she knew exactly
     what she was doing and what kind of an effect it was having on him.
     She was evil. That was the only explanation he could come up with.
     But he didn’t mind. Chrom wasn’t lying when he said he liked girls
     who made the first move.
     A study session in the library turns into something steamy after
     Chrom's mind goes wandering.
Notes
     For context, Chrom is a quidditch captain who's in remedial potions
     to pull his grades together. Robin is his tutor.
     pls don't get mad at me lol
See the end of the work for more notes
 
For someone who hated quidditch, Robin had the greatest pair of legs Chrom had
ever seen.
They weren’t bulky or corded like Sully’s hamstrings or stick-thin like
Lissa’s, but Robin's were finely toned and curved from years of sprinting
across the staircases and floors across Hogwarts. 
Chrom’s mind froze to a blank when he felt her foot was rubbing against his
thigh in the library. They were supposed to be learning about antidotes and
poisons, but his mind was anywhere but.
“According to Golpalott’s Third Law, the antidote for a blended potion will be
equal to more than the sum of the antidotes for each of the separate
components…” Robin’s glasses dangled enticingly between her teeth and she
rested her fingertips on the stack of books he was supposed to be paying
attention to.
“Simply put, the antidote for a blended poison cannot be created by finding the
antidotes for each separate component. Rather, a potionmaker must find the
single ingredient which, when added to the blended antidotes…”
Her foot rose dangerously close to his crotch and he let go a loud hiccup.
She paused, pink lips forming a small ‘o’ of mock surprise. “Chrom? Chrom. Are
you alright?” She let him go and he almost groaned in disappointment. His
crotch felt strangely bereft without her touch to keep it warm.
He opened his mouth to speak, but only a low grunt came out in response. “Erm
–“
“Oh, Merlin. That wasn’t very attractive,” she laughed teasingly. His neck
burned with embarrassment.
But he didn’t voice a protest when she stood to stand in front of him, fingers
gently tugging his tie and pulling him close to her chest. “Chrom, you seem a
little distracted. Am I doing something wrong? Exams are coming up, you know.
Don’t want to be unprepared.”
“Uh, well, I’m not –“
Amused laughter filled the room and Chrom suddenly realized that they were very
alone in the library. Robin climbed onto his lap, straddling him and
effectively pinning him into place. The tips of her toes barely skimmed the
surface of the floor. “Tell me what has your mind wandering,” she breathed.
The look on her face told him that she knew exactly what she was doing and what
kind of an effect it was having on him. She was evil. That was the only
explanation he could come up with. But he didn’t mind. He wasn’t lying when he
said he liked girls who made the first move.
Her head dipped between the juncture of his neck and he felt her smile curve as
she nipped and licked, hands tugging at his hair and he moaned into her shirt.
It clung to her chest like ivy to a wall. Heat pooled from his face down to his
crotch and he felt himself grow hard against her.
He placed a hesitant hand on the curve of her ass and she hummed with approval.
He let his fingers travel upward, then he froze. She wasn’t wearing any
underwear.
“Are you unwell?” That quiet calm in her voice steadied him, pulled his head
out of his ass and into the moment. He reached for his wand and performed a
contraceptive spell, almost daring her to stop him. To his absolute relief, she
didn’t. Her hands tugged and pulled at the buttons of his shirt, exposing his
chest and reaching down, down, down, to unzip his fly. He moaned with relief
when she took him in her hands. 
Almost of their own accord, Chrom’s hands slid up her stocking-covered thighs
and he kissed her full on the mouth. She squeaked in surprise, but gave in
anyway, their lips locked in a battle of dominance.
That moment of distraction was enough time for him to lift her and set her down
on the table, roughly sweeping aside the books and pots of ink in his way. She
squirmed underneath him and undid the clasp of her skirt, exposing her to him
as she pressed up against him. She was soaking wet.
"What're you waiting for?" she asked, almost pleaded. 
He paused, biting his lower lip. "I'm trying to figure out the best position
that's gonna make you come the fastest." 
Now it was her turn to be flustered. "Oh my god." 
Chrom grinned at her woflishly. He cupped her vulva with his hand and she
moaned, the first sound she made since she spoke moments before. She grinded
against him desperately and practically begged him to take her right there.
With slow, deliberate movements, he eased himself out of his boxers and
positioned himself at her entrance.
“Are you good? We can –“
“Do it, bitch!”
He thrust home and nearly lost himself. It was terrifying, the thought that he
was the only one who could make her feel this way, how her back arched and
curved above the tabletop to mold herself against his chest, anything to bring
her closer and closer to the blissful edge he didn’t want to meet. Not yet.
The table creaked against the stone floor in protest as he rocked against her
in the most uncouth manner he found horribly fascinating. Her tits bounced with
every thrust she made to meet the steady rhythm he set.
Gasping, Robin peered up at him through hazy eyes and half-parted lips. She
hooked a leg around his torso and he shuddered against her at the sudden
contact. Her nails raked down his back. Enticing tendrils of sweaty hair clung
to the valley of her chest. “Bro, is everything okay?” she asked lowly. She
nipped his ear. Chrom gagged. Her breath smelled horrific.  
“What?” He paused mid-thrust.
“I said, bro, is everything okay?” She smacked him across the face with her
hand. “Dude, are you even breathing?” The library ruptured into a whirlwind of
flying parchment and fire. Once he was sure the chaos was over, Robin’s face
morphed into a blurry creature of blonde hair with a tanned, hairy chest.
 
===============================================================================
 
 
Chrom opened his eyes and shrieked. Back at the dorm, Vaike and Stahl assaulted
his line of sight as they peered down with immense amounts of concern. They
were extremely close to his face. His feral instincts kicked in and he made a
grab for his wand, but Stahl held him back.
“Dude, are you okay?” asked Vaike in a hushed whisper. “You were like,
convulsing in your sleep.”
“I thought you were having a seizure!” cried Stahl frantically, his voice a
higher pitch than normal. Something loud cracked in the air as he broke apart a
chocolate bar stowed underneath his pillow. “Here, take some chocolate, it’s
supposed to dispel nightmares –“
An intense cold swept over Chrom. He was too stunned to register their concern,
still trying to anchor himself back to reality from the horrific dream he had
moments before. “I had a nightmare,” he said honestly in a flat distant voice.
“Dude, you should get checked out by Professor Naga, vague shit like that needs
interpreting or something –“
But there was nothing to divine from a wet dream other than one-sided sexual
frustration.
“I’m fine, I’m okay,” Chrom grunted hoarsely. Small cracks of light peeked
through the space between the curtains. “S’almost time for breakfast, so I’m
gonna –“ He pulled on his robes and made a beeline for the showers before
finishing his sentence.
He didn’t think he could look at Robin straight in the face for the rest of the
week.
 
 
End Notes
     I had absolutely 0 plans to publish this on AO3 last week. ZERO. I
     unearthed this from my Hogwarts AU outline from last year after
     talking to some chrobin friends on skype about how hard it is to
     write smut.....
     It made them smile, so I decided to post it here today! There's
     fanart too, but it's nothing explicit. This was published for all of
     you who are as saddened as I am about what happened this week.
     Hopefully it'll make someone laugh! We're all going to need some
     laughs, so let's start now. I am always available to lend an ear if
     you need to talk it out on tumblr @mairbelles.
     EDIT: I FORGOT
     Chrom's quidditch team:
     Keeper: Chrom
     Beaters: Sully and Vaike
     Chasers: Cordelia, Sumia, Maribelle
     Seeker: Gaius
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