There’s a good smattering of SPN size!fic out there on the interwebs, but it took me a long while to find the good stuff. All of this is SFW (aside from warnings listed) and definitely worth your while. There’s fics of all shapes and sizes (heh), so hopefully you find one that interests you. And I swear I tried so hard to find more tiny!Dean and tiny!Cas fics, but I’m afraid they are unicorns in the SFW side of fic anyway.
Summary: Sam was hit with a witch’s curse when he was 10 and Dean was 14. Unable to find him or his attacker anywhere when the dust settled, John and Dean Winchester were eventually forced to give him up for dead. Unbeknownst to them, Sam was saved from the witch and adopted into a new family, and they’ve trained him to take care of himself as best he can in the world, and protected him from the witch’s gaze all these years. And now…
Warnings: language
Word Count: 34,779
Sky’s Notes: Brothers Apart and its related works are not so much a series as they are a lifestyle. Borrower!Sam’s story is but the gateway drug into a beautiful interconnected series of AUs. The focus is always on the brothers’ relationship, and it is usually fairly canon-compliant aside from the obvious. And it’s ongoing! There are new stories and updates all the time. It’s feelsy, and snarky, and creative, and I am in love with it.
AO3 | Fanfiction.net | DeviantArt | Tumblr
Summary: On a case out in California, troubles afoot when Sam falls asleep in the Impala and Dean comes out to find his Baby – and his baby brother – a little… different.
Warnings: language
Word Count: 58,621
Sky’s Notes: This is one of those fics I keep coming back to read. The size interaction is on point, walking that thin line between careful!guilty!big!Dean and careless!teasing!big!Dean. There are some priceless moments (think Dean cuddling the tiny!Impala in his sleep. Yes. That happens.) as well as some genuinely scary parts. It twists and turns and goes everywhere you don’t expect. It’s probably my favorite fic of all time.
AO3 | Fanfiction.net | DeviantArt
Deanzilla vs Hydros by nej47
Summary: Dean slays a monster, only to become pretty monstrous himself. But Dean’s not about to let a little — okay, very big — size issue stop him from kicking ass and taking names.
Warnings: hurt/comfort imagery, language
Word Count: 145,714
Sky’s Notes: If you ever had a craving for big!Dean, look no further. This is everything you ever wanted, believe me. Humorous, angsty, a good dose of hurt/comfort, and an epic final battle all feature prominently. Dean is determined to silently push through the pain (both physical and emotional), and Sam is confused and concerned. Oh, and don’t forget all the snark. There’s lots of that. Set in Season 4, and as such has the obligatory inclusion of both Bobby and Castiel.
Fanfiction.net
Measure of a Man by nej47
Summary: Sequel to Deanzilla! On top of demons, angels and even Sam, Dean must also struggle with his new giant powers. To add insult to injury, the key to controlling them is an affront to his no-chick-flick-moments male pride.
Warnings: canon-typical violence, language
Word Count: 139,184
Sky’s Notes: This is the sequel to Deanzilla vs Hydros, and is set later in Season 4. There’s even more angst in this one. Like, so much angst. The entire story just builds and builds and builds to a crescendo here, ending with a very satisfactory “Lucifer Rising” AU. (Oh, and pssst there’s some tiny!Dean too!) I won’t spoil any more of the good stuff, just read it already!
Fanfiction.net | (there’s also a couple of oneshots on DeviantArt)
A Quantum of Solace by Celesma
Summary: “It was very clear to Sam that he was dreaming. That, or the witch had gone and cast the one spell he really, really wished she hadn’t—namely, the one that shrank people.” When Sam is injured from a witch’s shrinking spell, he learns where he and Castiel really stand. Unrepentant Sam/Cas fluff.
Warnings: canon-typical violence, language
Word Count: 72,918
Sky’s Notes: Sastiel at it’s absolute finest. There’s beautiful, poetic language, romcom worthy situations, sassiness, guilty!Sam, angelic!Cas, a smattering of Dean, all the fluff, a whole heap of angst, a very purple witch, and pumpkin spice lattes. You won’t be disappointed.
AO3 | Fanfiction.net
A Rare Sense of Humor by Obsess-Confess and giantgirl
Summary: In which the Trickster (Gabriel) takes it upon himself to teach Sam Winchester a lesson. So naturally, he shrinks him down to 6 inches and sends both brothers on a confusing wurst throughout New York City and beyond!
Warnings: mild violence, language
Word Count: 49,832
Sky’s Notes: Pure crack. The boys basically go on a scavenger hunt through New York City and…Candyland? Cas of course gets pulled in somehow, Gabriel is a well-meaning jerk, and Sam isn’t the only one to take a turn as a tiny.
DeviantArt
Short Notice by story_monger
Summary: After the witch and Dorothy incident, it should have been pretty clearly spelled out for everyone: don’t mess with artifacts in the bunker.
And for the record, Sam hadn’t messed with anything. It had been an accident.
Which, granted, didn’t make his situation any better. But it was the principle of the matter. In which Sam gets shrunk, Dean panics, Castiel handles Winchesters, and Kevin saves the day. (from Part One)
Warnings: canon-typical violence, language
Word Count: 37,452 (full series)
Sky’s Notes: This series reads like an actual series of episodes. There’s cracky fun, a good dose of angst, and enough twists to keep the guesses coming. The plotline is compelling, and while Sam is the focus, each of the characters are given emotional and functional weight. Also, Kevin and Crowley feature!
AO3
I Keep Looking At The Sky by prairie_city
Summary: The one where Sam gets shrunk, and Dean finds himself cursing at the…at, well, shit.
Warnings: language
Word Count: 7,600
Sky’s Notes: Sam loses his height. Sam loses his shoes. Sam loses his cookies. He also has a gun and he’s not afraid to use it. Dean is torn between laughter and overbearing concern. Snark, awkwardness, schmoop, and everything in between — it hits all the highlights, folks. Bonus points for a Bobby cameo.
LiveJournal
The Incredible Shrinking Sam by mamapranayama
Summary: While getting to know each other again as brothers and partners, Sam and Dean run into a rather small problem. Set season one.
Warnings: language
Word Count: 37,586
Sky’s Notes: This is a romp of epic (minuscule?) proportions, featuring a slowshrinking!Sam. Between Sam’s predicament, Dean’s coping, a pair of grudgingly likeable OCs, and lots and lots of snark, this casefic has pretty much everything going for it. Oh, and Bobby is involved!
Fanfiction.net
Summary: Sam and Dean are on a regular salt and burn to find a missing girl when they discover a haunted dollhouse – and Sam’s about to become one of the dolls!
Warnings: language
Word Count: 7,792
Sky’s Notes: A casefic, short and sweet and fun. Mostly Sam-centric, but Dean has some moments too. Very in-character and keeps the SPN spirit. It could be a legitimate episode. It’s not like we haven’t had some seriously cracky episodes before.
AO3
Minutus by Hellootricksterr
Summary: While searching the Men of Letters base, Dean finds a strange little statue. He shouldn’t have picked it up. Now he’s tiny, for three days! What’s a hunter to do when he can’t do anything?
Warnings: language
Word Count: 54,144
Sky’s Notes: Finally some Tiny!Dean! SO MUCH FLUFF. Also antics and general silliness, because this is Dean we’re talking about. There be pockets, pie, concerned!Sam, the obligatory brotherly bonding, movie nights, all sorts of lovely references to The BFG, and of course a good dose of Destiel.
AO3
The Parting Gift by PeaceJoJo
Summary: “What the hell?” Sam asked as he watched his brother’s hand get bigger and felt his brother’s waist pull away. His hand slid across the fabric of the back of Dean’s navy blue jacket. When Sam went to look to his left into his brother’s face, he was shocked to see Dean’s chest instead lit up with the lights from the Impala. Was Dean standing? Sam looked down and saw his brother’s legs still folded on the ground. “Holy crap. You’re growing.”
Warnings: mild language
Word Count: 5,217
Sky’s Notes: Dean is big, and as determined as ever to suffer silently. Sam obviously isn’t about to let him. Come prepared for the usual playfulness and a good ol’ brotherly click flick moment discussion.
DeviantArt
Small Worlds by rionaleonheart
Summary: Sam and Dean are hunting a Gorgon. Which would be annoying enough even if Sam hadn’t somehow shrunk to ten inches tall.
Warnings: language
Word Count: 3,863
Sky’s Notes: This is too cute. Dean is insufferable, Sam is furious, and the snark of the century ensues.
LiveJournal
I’ve left out many, many good fics, I’m sure, so if you have a suggestion for the list, point me in the right direction and I’ll go check it out! I’ve also tried to link the authors who have tumblrs, at least that I’m aware of. If you’re an author featured on this list — HI I LOVE YOU I’M SUCH A BIG FAN OMG. If you want your tumblr to be linked (or unlinked), let me know!
Brothers Apart 