Preliminary Snarry rec list:
Chrysalis, NC-17, 86k words.
In which Harry is a tad messed up after the war, but Snape gives him a run for his money.
No Cosy Cottage Holiday, NC-17, 13k words.
Harry and Snape enter a house to break the curses in it and make it inhabitable for the new owner. Unfortunately they didn't count on something going wrong, least of all, on one of the curses affecting them this deeply. (Forced bonding fic)
Once More With Feeling, PG-13, 11k words.
Two enemies, trapped in Voldemort's dungeons together, awaiting their execution. With an hour left to live, how do they decide to spend it? (With a twist--time turner-less time travel. Groundhog's Day-esque.)
A Certain Kind of Fool, NC-17, 38,700k words.
For Severus, everything changes when Harry and his children move into Hogwarts. Albus Severus has taken a liking to him and it seems Harry Potter has a secret. (other fic by same writer)
If You Are Prepared 1/2/3, M, 15k/68k/110k words respectively.
A task he can't refuse. A boy he doesn't want to refuse. (classic fic in snarry fandom)
Rapture, NC-17, 50k words.
Snape sees the man, for the first time, on his twenty-fifth birthday. (classic snarry, time travel)
A Perfect Plan, NC-17, 12.5k words.
"Afternoon classes were equally normal. The mixed second/third year class had one success out of forty eight failures, Potter's hair felt like silk under his fingertips as Snape petted him during the seventh years' class, and the sixth years nearly poisoned one another trying for relaxation potions, but he had antidotes ready and only one of them actually turned to stone before he could get to her. Infusion through the cracks worked as easily as ingestion in that case. All perfectly normal."
Parseltongue-tied, R, 16k words.
Harry makes friends with one of nature's shy creatures.
A Choriambic Progression, NC-17, 92k words.
Snape is under a curse and he must stay locked up with Harry, who finds out about some powers he has but doesn't want to use.
Second Best, NC-17, 23k words.
Two lonely men find each other in an internet chat room, and ultimately discover that it is, indeed, a small world after all.
Owl You Need Is Love, no listed rating--PG-13 to be safe, 11k words.
Prompt: It turns out wizarding owls don't hatch already knowing how to deliver the post but have to be trained for it. Either only Harry's (or Severus's) magic is up to the task in Britain (or wherever you think fits best for the story) or it's his own choice of career. The other one's owl is behaving erratically.
Overbooked, M, 2.8k words.
Molly Weasley knows better than to match Severus and Harry together...but she just cannot resist.
Sex, Lies, and Audiobooks, M, 48.5k words.
Belonging and deserving, needing and wanting--desires of the human heart that Severus and Harry must face when they're forced to the little village of Lochdubh to settle a very late codicil of Albus Dumbledore's will.
Patronus Play, R, 4.7k words.
Patronuses love to play, especially when it brings their wizards closer together.
A Hundred Million Suns, NC-17, 8k words.
Harry is impotent, and, for once, does his own research and finds a treatment that can help him. (warning: Harry is referred to as a virgin--even though he has obviously had sex--just because he has not penetrated a lover using his penis. I ignored the cis view on sex and enjoyed the story nonetheless.)
Corresponding With Snape, NC-17, 4k words.
Who would have guessed that writing silly notes to someone could change the way you feel? (kind of ooc but still good.)
Expecto..., PG-13, 10k words.
Snape gets a visit from the stork stag. Harry gets an unwanted house-guest.
Finding the Way Home, NC-17, 7k words.
The Floo system is supposed to be foolproof, but we all know that odd things happen when Harry Potter is involved.
Sweet Surrender, M, 25k words.
More than a year has passed since Harry left the Wizarding world. Now he's known as the Pie Maker, but his quiet life is about to be disrupted by an unexpected visitor and a murder. (Pushing Daisies AU)
Mirror of Maybe, M, approx 220k words.
Harry Potter falls into a mirror and lives 13 years of his life there only to be returned to his 15 year old body. (classic Snarry? warning: unfortunate use of the nickname Sev. Technically chan? Kind of super powerful Harry.)
Hogwarts Knows Best, M, 22k words.
Guess who's the new Potions professor at Hogwarts? And guess where he goes seeking advice? (involves room of requirement. Extremely adorable. A bit fluffy at points.)
Cockroach Clusters, Please, NC-17, 19k words.
A defeat in a Knockturn Alley battle convinced Harry that he needed to learn more before he could even think about defeating Voldemort. A most unusual idea came to mind… (young Severus, room of requirement fic, time travel-ish through requirement)
Only In Their Dreams, M, 12k words.
Harry takes a dream enhancing potion and quickly becomes addicted to his nocturnal dates with the mysterious Half-Blood Prince. What happens when Harry’s addiction messes with his chances for a real relationship with Ginny?
Scratch a Cynic...., NC-17, 1.4k words.
Someone sees Snape's bare back and thinks that he tortures himself. The piece of gossip spreads and other professors try to help the man, which of course drives him mad. (rough sex)
The Arrangements, PG-13, 7.6k words.
Harry and Snape teach at Hogwarts -- Harry convinces Snape to pretend to be in a relationship with him just to keep the new teacher in town (who doesn't seem to understand 'not interested') off his back. (pretty ooc, still a good read)
Unnatural Desires, NC-17, 12k words.
Harry has some kind of accident and can only speak in Parseltongue, which drives Snape mad with desire.
A Bittersweet Potion, M, 70k words for book one.
Harry Potter is given the Gift, which means he is able to shape shift into any kind of animal. One of his favored forms, a black and white cat, gets adopted by the least likely pet owner in the school: Severus Snape. (bit of a snarry classic...quite dark, but so wonderfully written--mentions of murder, violence, gore, torture)
Tea Series, M, 369k words.
Severus Snape does not hate Harry Potter quite as much as he'd like everyone to think. (classic snarry, very well written)
An Awkward Customer, NC-17, 10k words.
Snape can't figure out why Potter is hanging around his shop. (classic romantic-comedy plot)
Gen fic that is amazing enough to read anyway:
Knick-Knack-Paddywhack, Gen, 4.2k words.
His trainers were too big again. (Six year old Harry has quite a birthday.)