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When a conversation around the campfire one night turns to the topic of dirty talk during sex, the knights proceed to try and outdo one another at it, yielding some truly hilarious attempts. Merlin's roped in after a fashion because the knights reckon it'd be golden to hear Merlin talking dirty, only Merlin turns out to have the filthiest mouth in their company, getting everyone squirming barely minutes into his session.
Arthur's more affected than he'd like to admit, and finds he can't stop thinking about it later even in the tent that he's sharing with Merlin...