You know some fics in wich Sherlock is an alien?
The idea popped up in my head yesterday but i don't know exactly how to search it on AO3.
I do! These are the only "alienlock" fics I know of, though one is John-alien:
The Kepler Problem by kinklock (E, 24,270 w., 1 Ch. || Sci-Fi AU || Alien Sherlock, Space Repairman John, Alien Biology, Horny John) – Working in uncharted space exploration was not as exciting as John had hoped, especially when it turned out to be mostly bot maintenance on uninhabited planets. However, the mystery of the repeated, unexplained malfunctions on planet BAK 2212 might turn out to be exactly the kind of adventure he'd been craving.
The Semantics of Crop Circle Formation: a case study by Sherlock Holmes [unpublished] by canolacrush (M, 41,710 w., 9 Ch. || Post-S2, Sherlock POV First Person, Aliens, Wordplay, Case Fic) – “Look at these photographs,” I said, gesturing to the wall of crop circles. “What do you observe?” “Crop circles,” John replied. “Obvious. What else?” “Are…are those intestines surrounding them?” “Yes. The majority are bovine and ovine in origin. The farmers who have acquired these crop circles in their fields have also had a tenth of their livestock murdered and arranged thus.” “Why?” John said, presumably in a rhetorical fashion. I detest rhetorical questions. “That is what I must find out, John.”
Names for the Galaxy by evadne (E, 191,101 w., 38 Ch. || Future Sci-Fi AU || First Time, Violence, Teacher/Student Dynamics, Ableism, Angst, Bigotry, Disturbing Content, Amnesia) – Sherlock Holmes is a recent arrival to 22nd century earth, and determined to find out who he is and where he comes from. John Watson has the unenviable task of teaching him how to be a normal human being. Part 1 of the Names for the Galaxy series
And these fics are "alien adjacent" in a sense:
Captain John Watson, Genetics, and Other Crazy Things by cyerus (M, 5,581 w., 1 Ch. || Torchwood Crossover || Humour / Crack, Jealous Sherlock, Sexual Magnet John, Captain John, UST / RST, Three Continents Watson) – The explanation for John "Three Continents" Watson? Jack Harkness is his father. Sherlock doesn't know whether he's going to die from jealousy or sexual frustration first.
The Short Tragic Death of John Watson by Calais_Reno (M, 49,681 w., 9 Ch. || Actor / TV Show AU || John “Dies”, Victor Trevor, Past Drug Abuse, POV Sherlock, Suicidal John, Implied / Referenced Abuse, Acting, Pining Sherlock, Happy Ending) – Thirteen years ago, Sherlock starred in a television series about an alien boy stranded on Earth. Now Molly has written a reunion episode and he's expected to join his old costars and recreate the role of Alex Tribble, now an adult returning to rescue his old friends from an alien threat. Having had some success since playing a teenage alien, Sherlock is reluctant to reprise the role. And there's another problem no one wants to discuss: John Watson, who played his best friend, is dead.
If He Be Worthy by AndyHood (T, 58,110 w, 18 Ch. || Avengers / MCU Crossover || Friendship, Adventure) – In the aftermath of the alien invasion of London, Coulson's team is set out to retrieve a man, a man that had picked up Thor's hammer. John Watson hadn't meant to get mixed up in the alien invasion only intending to repay a favor. He had only been surveying the damage done by the aliens when he had tripped on a hammer, he didn't know the significance of being able to pick it up.
Perdition's Flames by i_ship_an_armada (E, 63,435 w., 21 Ch. || Treklock AU, Est. Rel, Genetic Engineering, Angst & Fluff, BAMF!John) – Sherlock would do anything to save him. Risk anything. Give anything. His money, his life. His soul. What he does, though, is change both of their destinies forever. Genetic re-engineering is the only option left. It turns out researchers underestimated the life expectancy and potential abilities of genetically re-engineered subjects. The British government and what would eventually become the United Federation of Planets, however, had not. Part 1 of PF Universe
Out There by DiscordantWords (T, 131,695 w., 10 Ch. || X-Files Fusion || Past Soldier John, Panic Attacks, POV Alternating Present Tense, Anxious John, Canon Adjacent, Deductions, Obsessive Sherlock,, Travelling, Sherlock’s Family, Jealous Sherlock, Mind Palace John, Awkward Flirting, Kidnapped/Abducted John, Semi-Reverse Reichenbach, Worried/Anxious Sherlock, Hospital, Slow Burn, UST, Case Fic, Government Conspiracy, Aliens, UFOs, Mutants, Mutual Pining, First Kiss, Coma John, Forehead Touching, Hand Holding, Drinking/Bars, Past Jolto) – FBI Special Agent John Watson, medical doctor and army veteran, is assigned to assist eccentric genius Sherlock Holmes with paranormal investigations on the X-Files project.
And finally, I think you'll also enjoy these lists:
Science Fiction / Fantasy
Doctor Who Crossover Fics (MFLs)
If anyone has something that they would love to suggest, please do!