Fics like Day 27 - Bad Wolf (a):

The Ponds have a bet that neither can settle so finally Amy decides to go straight to the source. Unfortunately, the Doctor is blissfully unaware of just how mortal humans are despite all of his boasting about superior Timelord memory. “Ah Pond, settled your wager then?” “Not quite. We were just…” “Just what, Pond?” “We were just wondering how long you and Rose have been travelling together for?”

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