Are you in the market for stories where Kirk and Spock meet as children and grow up together, becoming friends, brothers, and lovers over a period of many years? Then you’re in luck. Here are some of my favorites in the genre. Arranged by bigness of size. Some may contain sexual activity between minors.
Adventure Is Out There, by Straight_Outta_Hobbiton and notfreyja | AOS | Teen | 12,922 words | Part 1 of Doubt The Stars | Jim is just the average, everyday, Starfleet-brat boy genius. His time is split between the mostly-Vulcan engineering crew and raising hell on the rest of the ship. If anybody (including Jim) knew the details of what occurred during his first trip to Vulcan, they wouldn’t be surprised.
I Will Have This, by orphan_account | TOS | G | 15,541 words | Part 1 of T'hy'La | Just as she finished adding a small box of sweets to her items, she felt a tug on the sleeve of her robe. Turning, she had a smile prepared, and a praise on the tip of her tongue for whatever item her son had chosen. That turned into a sharp gasp when she realized that carefully ensconced in her son’s arms was not any item for sale in the shop, but a very human baby. “Mother, I will have this.”
Gift, by littlebirdtold | AU | Explicit | 30,886 words | Spock gets a small golden-haired, blue-eyed creature as a gift from his father (except he doesn’t). The creature speaks in his nurse’s Secret Language, appears to be convinced that Spock is an “elf” and calls itself “Jim.” Utterly fascinated, Spock decides to keep it.
Foundations, by notboldly | AOS | Mature | 44,819 words | Amanda only wanted what was best for her son, and after Sarek’s death, she was certain that Vulcan was not it. However, she had never expected it to be Iowa either, or rather, a poor little boy from Riverside.
Magpie, by waldorph | AOS | Explicit | 57,648 words | Spock met Jim when he was 7 and Jim was 6. It has since been generally agreed that this was a mistake (or: the one where they grow up together and things are simultaneously better and worse for it).
In Time, by yeaka | AOS | Explicit | 58,732 words | Winona Kirk is leaving, and Spock makes the ‘perfect’ caretaker. (Until Jim grows up, and everything changes.)
Refuge, by ThereBeWhalesHere | TOS | Teen | 70,138 words | In a less powerful, less united Federation, Romulus takes an opportunity to attack Vulcan and Federation planets begin taking in Vulcan refugees. One of these refugees, a young Spock, stays with the Kirk family on their farm in Iowa. Everyone thinks it’s temporary, but after a few years Earth becomes as much a home to Spock as Vulcan ever was, and the Kirks—especially Jim—become family.
The Sum of Both of Us, by spicyshimmy | AOS | Mature | 207,623 words | Jim Kirk is nine when a massacre on Tarsus IV leaves him without a family and without a home. Spock is twelve when a strange boy in the desert saves his sehlat. Families aren’t born; they’re made.
The Promise, by coffee666 | AOS | Explicit | 207,872 words | As children, Jim and Spock promised they would get married when they grew up. Jim thought it was just a silly joke between kids. When they meet again upon the Enterprise, Spock still expects Jim to fulfill that promise.