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Clark is looking at some file and Lana stops by and
reminds him they were supposed to go for a cup
of coffee after work he has totally forgotten.
Lana: Well then I should probably leave you to it.

She's joking about leaving him to spend some time with the file?

Next round's on you. It's his treat next time?
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Hi
Leave someone to it - leave them to get on with whatever they were doing
Next round's on you - you will buy the next drinks.
Comments  
Thanks, opti!