Top 10 Mature Star Trek Fanfics
Something Smart to Do
Completeby kianspo · James T. Kirk/Spock
In which Jim finds himself fake-married to his first officer every other month. It's not his fault. Mostly. Dowries and Klingons are involved. Starfleet is decidedly not amused.
The Genetic Soap Opera (or, One of the Less Dignified Royal Weddings)
Completeby waketosleep · James T. Kirk/Spock
Turns out Jim Kirk's more than meets the eye, genetically speaking. There are a lot of consequences, mostly for Spock and his sanity.
Please don't touch the Vulcans
Completeby museaway · James T. Kirk/Spock
The "yes" is out of Jim's mouth before he can think about it.
cast out fear
Completeby s0mmerspr0ssen · James T. Kirk/Spock
Kirk saves Vulcan from Nero at high cost to himself. It falls to Spock to pick up the pieces.
Entering Orbit
Completeby museaway · James T. Kirk/Spock
Jim escapes to Iowa to avoid the media frenzy following the Narada incident, but a late-night miscommunication results in Spock turning up on his front porch.
Cause and Effect
Completeby Ragdoll (Keshka) · James T. Kirk/Spock
In the midst of Vulcan's destruction, Jim Kirk saves the life of a Human woman he only later learns the name of: Amanda Grayson. It isn’t long before Spock finds gratitude transforming into a crippling and terribly inconvenient attraction.
That One Time When Jim and Spock Met Their Daughter From the Future
Completeby pristineungift · Spock/Nyota Uhura
You know your day is going to be weird when some kid you’ve never seen before calls you ‘Papa.’
infixion
Completeby Etharei · Spock/Nyota Uhura
A mission of this duration has never been attempted. Just a few months in, the crew of the Enterprise are beginning to understand why – luckily, they are also, somehow, making it work. A series of events, both great and small; featuring cameos by unsuspecting planets, complicated interpersonal relat
The Place Between
Completeby PsiCygni · Spock/Nyota Uhura
"No, Gaila. I am not, absolutely not going to walk into Commander Spock’s office and suggest that we pretend to date for an entire summer. I mean, we… I… he’s not… I couldn’t even spend that much time with him, nor would I want to. He’s so… he’s just really… I have professional mores, Gaila. Sta
Redshift
Completeby museaway · Spock/Nyota Uhura
Dual tragedies bring the Enterprise's command team closer together, but the gap between them grows when Spock discovers something in Jim's mind.
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About Mature Star Trek Fanfiction
This list features the 10 highest-kudosed mature fanfics in the Star Trek fandom. Every story listed has been recognized by AO3 readers with substantial kudos — the platform's main signal of reader engagement.
Mature-rated fics contain adult content as defined by AO3's rating system. All stories below are flagged mature by their authors. Reader discretion advised.
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