A/N: This fluffy Domestic Assassin drabble was partly inspired by a recent headcanon about Anna studying neuroscience in med school (which I helped prompt, accidentally), and by a fanart of same. The title can be interpreted more than one way. ;)
"Fluff for Brains"
Anna knew that med school was going to be hard work. She'd thought that she might even enjoy some of the classes—anatomy, biochemistry, genetics, cell biology. Neuroscience, on the other hand...
"Stupid... freaking... brains!" she shouted, slamming her head on the open book in frustration, scattering pencil and papers around the table. She'd been studying this nonsense for hours and hours, dragging into the wee hours of the morning.
Anna had decided, not too long ago, that she hated neuroscience. Trying to understand the subject was like... like trying to understand how her dorky, clumsy, unassuming, cat-loving sister could possibly be an assassin—and be good at it.
Speak of the devil, she thought, hearing a loud thump at the front door. The door opened, letting a chilly breeze into the room, and in staggered Elsa Arendelle, Ice Queen and domestic assassin, looking as if willpower alone was holding her upright.
Dumping her equipment in the nearest out-of-sight place (the closet), Elsa stared at her sister for a moment, before mumbling something that sounded enough like "Why're you still up?" that Anna understood.
"I could ask the same," Anna replied. "Elsa, you look totally wrecked."
"Mm-hmm." the blonde mumbled. She shuffled over to the living area, where there was an ample number of cats waiting for her. She stared at them for a minute, before flopping onto the couch near one of the fluffy groups, and proceeding to snuggle in with them, as if they were her pillows.
It was the cutest damn thing Anna had seen all week, even though she was worried about Elsa's health. Stifling a yawn, she turned back to her book. The words on the page made even less sense now, letters blurring together from her own lack of sleep. Glancing over at the peacefully sleeping form of her sister—with a gaggle of cats keeping her warm—and then back at her book, Anna finally gave up.
Screw the stupid brains, she thought, closing the book. She stood, muscles aching from sitting, and went to go join her sister in fluffy bliss.