Well, title says it all: this part is for romance-fics where Harry is in a slash-relationship. Nearly all of those will be Harry/Snape as this is the one slash-pairing that I primarily read, interspersed with some Harry/Draco.
This one is a lot harder to compile, partly because this is the pairing I started reading HP-fiction with and back then I didn't save a great many links in my favorites, partly because there are just so many good Snarry-stories and partly because a great many of those Snarry-stories are fluffy one-shots.
Why do I use Harry/Snape sometimes and at other times Harry/Severus? I'm trying to use the former if Harry is still Snape's student and the latter if their meetings are more meetings of equals (Harry in the past meeting a younger Severus, Snape de-aged, Harry an adult who has graduated from Hogwarts.)
Ambiguous Morality by Jadzia
jadzia7667.
Harry/Severus. On his 21st birthday Harry finds out that Snape is calling in the lifedebt Harry owes him by forcing him to marry him.
Complete. NC-17.
Animagus Love by Jadzia
jadzia7667.
Harry/Snape. In an old potions book recently inherited, Snape finds a potion which will allow him to become an Animagus immediately but alas, he overlooks that there is no antidote. When Lupin comes to get his Wolfsbane potion, he finds a black chinchilla near a familiar potions book, and he understands what happened. The headmaster takes advantage of Snape’s predicament to put him in Harry’s care, and he makes Harry believe that its Snape’s pet.
Complete. R.
Anniversary by RaeWhit.
Harry/Severus. After Voldemort is defeated on Harry’s eighteenth birthday, the Headmaster makes a deathbed request: that Harry and Snape spend the anniversary of that victory alone together, every year, until they are magically released from the obligation. This is the story of the seven anniversaries that follow, and of the mutual animosity that was transformed into something altogether unexpected.
Complete. R.
Beech Hall by Aucta Sinistra.
Harry/Severus. Dumbledore sends Snape to Harry's manor for his protection.
One-shot. PG-13.
Catching the Snitch by Magdelena.
Harry/Severus. Harry shows up unexpectedly at a Quidditch match at Hogwarts to meet his mystery fiance. Set 4 yrs after Harry graduates Hogwarts.
R. One-shot.
Charles Alexander Tompkins by Taran.
Harry/Severus. Snape dies to protect Harry. Who is the new student in school?
Complete. NC-17.
Come What May by
the_minx_17.
Harry/Draco, Harry/Snape. Pushed into a corner Severus Snape handles it the only way he knows how… he kills Albus Dumbledore. Harry Potter returns to the castle determined to find the power to kill not only Voldemort but also the man who took his mentor away from him, Severus Snape. Instead, he overhears a damning conversation between two people he trusted. Finally using his innate Slytherin cunning, he digs deeper and finds not everything is as it appears. Will it change his loyalties or just the way he fights?
Complete. NC-17.
A Convenient Marriage by Diana Williams.
Harry/Snape. Sometimes a marriage of convenience can become so much more…
Complete. NC-17.
The Courtship of Harry Potter by Diana Williams.
Harry/Snape. Another teacher's interest in Harry Potter forces a reluctant Snape to compete for the young man affections.
This is the story that not only introduced me to HP-fandom but also to slash and will always stay one of my absolute favorites.
NC-17. Complete.
Death Eater Takes a Holiday by Lee Lee Potter.
Harry/Severus, Ron/Hermione. Several members of the Hogwarts staff take a de-aging potion over the holidays when only a few students are at school. Young Severus and Harry fall in love. What will happen when Severus returns to his true age and remembers who Harry is?
WIP. NC-17.
Don't Rock the Cradle by Corgi
goldpemcorgi.
Harry/Snape. Severus must acknowledge that Harry and the child he carries are his before the Minstry tries to take him away.
Prequel
A New Tradition,
Sequels
The Joy of Parenthood,
Christmas Presents, Celebrating a New Life,
Petunia's Gift and
The Christmas Monarch.
Complete. R.
The Dreaming Spires by DementorDelta.
Harry/Snape. After the war Harry searches for Snape and finds him as chemistry teacher in the Muggle world.
Complete. NC-17.
Dumbledore's Folly by DementorDelta.
Harry/Severus. When Dumbledore makes Harry and Snape joint heirs for an old house of his, Snape has to court Harry so they can transfer ownership legally.
R. Complete.
Falling in Love by Magdelena.
Harry/Severus. Harry has come to work at Hogwarts, and has set his sights on the Potions Master. Complications arise when his ex-lover Draco Malfoy enters the picture.
Sequel to
The Arrangement: Severus/Lupin,
A Brief Interlude: Harry/Oliver and
Taking a Chance: Harry/Draco.
Complete. R.
Filtered past Boredom by RaeWhit.
Harry/Severus. Returning to Hogwarts to teach, Harry brings with him the disappointment of a life gone wrong and the expectation of a year filled with boredom. So he sets for himself a game of distraction: the seduction of Severus Snape.
Complete. NC-17.
Ghosts of a Memory by Phoenix Boy.
Harry/Severus. Harry has died several years ago after his defeat of Voldemort. Now James Evans applies for the post of DADA-teacher.
R. Complete.
Going Postal by
bethbethbeth.
Harry/Snape. Years after his death, Albus Dumbledore still has the uncanny ability to pester people, as Severus and Harry will soon discover.
One-shot. PG.
A Graduation to Remember by Magdelena.
Harry/Snape. Severus' attitude abruptly changes after the final battle. Students and staff are concerned over his now delightful demeanor. And what exactly does Harry Potter have to do with his new change?
One-shot. R.
Holiday Hell by Corgi
goldpemcorgi.
Harry/Snape. Albus locks Harry and Severus in a snowglobe over the Christmas Holidays in order to get them to work together.
Sequel
Twenty-four Hour Torture.
Complete. NC-17.
Just a Few Letters off by Devi, the Wynter Witch.
Harry/Snape. Harry tries to woo Seamus with letters but the owl is hard of hearing and accidentally delivers them to Severus.
Complete. R.
Lockdown by Vorabiza.
Harry/Draco. Four Gryffindors and four Slytherins under a forced lockdown in the potions classroom for two days.
NC-17. Complete.
Need a Date by Vorabiza.
Harry/Draco. Hermione keeps nagging Harry about a date for the Celebration Ball that’s occurring a year after Voldemort’s defeat. He causes a bit of a stir when he decides to ask Draco, especially when Draco agrees.
PG-13. Complete.
Not Your Usual Veela Mate by Janara.
Harry/Draco, Severus/Lucius. Draco is a Veela and Harry is his mate. Harry is disenchanted with Dumbledore and his friends (who are completely under Dumbledore's thumb) and jumps upon the occasion to get away from them.
NC-17. WIP.
Order of Merlin, First Class by Lychee.
Harry/Severus. Another reception for the heroes-and Harry is looking for a way to escape. When he finally finds the perfect hideout, he discovers that he must share it…with a most unlikely companion.
One-shot. NC-17.
Over Tea by DementorDelta.
Harry/Snape. Snape and McGonagall forge an unusual friendship until a certain student tests the bonds.
PG. One-shot.
The Paradox of Existence by DragonLight.
Harry/Severus. On assignment for Dumbledore in the past, Harry sees his lover from an unexpected perspective. That of a teacher. The future repeats itself in the past, i.e. which came first, the chicken or the egg. Harry and Severus are lovers in the present time when Dumbledore sends Harry back in time to become DADA-teacher for a year during Severus' time at school.
Complete. R.
Parseltongue-tied by DementorDelta.
Harry/Snape. Harry makes friends with one of nature's shy creatures. Snake-assisted wanking.
R. One-shot.
Parsley, Sage, Rosemary and Thyme by FemmeSlash.
Harry/Snape. On the search for true love Harry isn't very discriminating with his partners, ending up with a magical sexually transmitted disease. When he finally figures out who his true love is, will Severus think the less of him?
Complete. R.
The Picture by Taran.
Harry/Snape. Harry finds an enchanted picture of Severus Snape from his school days. It leads to more romance than Harry ever dreamed of.
Complete. R.
Pretty Little Drawings by Lychee.
Harry/Snape. Who hasn't ever drawn a naughty picture on a scrap in their homework notebook? Hmm? Harry is no exception to the rule. Except that it's his Potions homework, and he turns it in without realizing.
Complete. NC-17.
The Protector by Betsanne.
Harry/Snape. Harry Potter recieved a necklace the night before his graduation from someone calling themself The Protector. Who could it be? What will happen when Harry finds out?
One-shot. R.
A Question of Circumstances by Medea Nevermore.
Harry/Snape. Harry overhears Snape talking to Dumbledore. WHAT? Snape's *attracted* to him?!
Complete. R.
The Return of the Prodigal by Lachesis.
Harry/Severus. Harry ends up in his parents' seventh year and falls in love with Snape.
NC-17. Complete.
Secrets by Vorabiza.
Harry/Draco. Beginning with Draco's unexpected arrival at the Dursleys, Harry's summer after sixth year becomes filled with activity and many secrets. As his summer progresses, Harry generates several unexpected allies as he finds himself actively becoming the leader of the Light side. Post HBP.
NC-17. Complete.
Silverbells, Snowglobe Hell by
ataraxis and
separatrix.
Harry/Snape. Albus locks Harry and Severus in a snowglobe over the Christmas Holidays in order to get them to work together.
Complete. PG-13.
Snape's Dare by Betsanne.
Harry/Snape. Severus Snape attends the End Of Year Teachers party where he is introduced to Truth or Dare. What is Snape's dare and will he actually do it?
R. One-shot.
Thank you, Lord Voldemort by
resqgal.
Harry/Severus. Harry is thrown back in time to the time of his parents.
Complete. PG-13.
A Time to Change by Sansa.
Harry/Severus. Harry wishes he was never the Boy-Who-Lived and his wish is granted. Now he has to bear the consequences, namely sacrificing everything he has gained in order to save his world. He finds love along the way, but will it be snatched away from him just like everything else?
Complete. R.
The Unexpected Truth by Magdelena.
Harry/Severus. Harry and Severus try to figure out how in the world they wound up naked, hung over, and apparently...gulp...married.
Complete. R.
Valentine's Day Disaster by Taran.
Harry/Snape. On Valentine's Day, a mysterious box of chocolates in the shape of a heart appear to both Severus and Harry, it doesn't matter who sent them or why, you can fill that in however you like. The following phrase must be included: All it takes is one chocolate. That one piece of chocolate you have just eaten will make you spout a heartfelt truth to your one true love and this spell lasts for 24 hours. That phrase will magically appear on the box after the first chocolate is eaten.
Complete. NC-17.
Walking in his Shoes by
hproundrobin.
Harry/Snape. Albus decides that Sev and Harry should spend a week in each other's shoes in order to better understand each other. They must spend a minimum of one week in each other's bodies, but before they can switch back, they must perform an act of selfless love. Also, they can't tell anyone and they have to completely fill each other's roles in the school.
Complete. R.
What a Malfoy Wants by Corgi
goldpemcorgi.
Harry/Severus. Checking through different magical orphanages after the War, Harry finds Malfoy's daughter in appalling conditions and rescues her. She is also Severus' godchild.
R. One-shot.
Sequel
A Malfoy Gets.
Wooing a Slytherin by Magdelena.
Harry/Severus. Harry and Severus are both professors at Hogwarts, and have an amiable working relationship. Harry is infatuated with Draco Malfoy, and asks Severus for tips on how to woo Draco. Somewhere along the way, Severus realizes that he wants Harry for himself.
Complete. NC-17.
Yin and Yang by miasnape.
Harry/Severus. Harry is in an established relationship with someone he loves and who loves him, too. But is Harry in love with him? If he is, why does he keep thinking about Snape in that way?
One-shot. R.
My other lists.
As so many of the Harry/Snape-stories I liked when I first read them are One-shots, it's rather hard to list all of them. So this list certainly doesn't contain every Snarry I ever read and liked.