It's the Great Pumpkin, Duncan MacLeod (1/1) - HL/Castle

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Title: It's the Great Pumpkin, Duncan MacLeod (1/1)
Author: strangevisitor7
Fandom/Universe: Castle & Highlander.
Beta: ithildyn
Rating: PG
Characters: : Rick Castle, Duncan MacLeod & Methos (Adam Pierson)
Prompt: #75 Shade for crossovers100

Summary: Rick and Methos invite Duncan over for a very special drink.

A/N: The is the sequel to Orange you Glad We're Friends?. You should read that first or this won't make much sense.

Castle, do I want to even know how you have something this lethal sitting around your apartment