Title: Practical Gifts of Affection
Beta:
logicallyerinFandom: Star Trek
Pairing: Kirk/Spock
Rating: R
Warnings: sex talk
Summary: Prompt: "In a secret santa, Kirk is given a buttplug/dildo and assumes it's from McCoy who protests his innocence. Kirk uses his superbrain to go through the computer records and traces the order for it back to Spock!"
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AO3