Weekly Drabble/Sketch Challenge 99

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For the next few weeks, prompts will be based around OTHER SERIES THAT RUSSELL T DAVIES OR STEVEN MOFFATT HAVE WRITTEN (an inspired/original prompt idea). Most of these series are strongly recommended by this mod, at least. (the RTD!Casanova is one of my favourite TV things ever. Watch it, watch it, watch it).

Please take the title however you wish (either as a crossover, or in this case as the historical personage, or the idea of a serial romancer, or sex-alcoholic, or compulsive gambler, or a frame narrative -weak, but I'd accept it - or whatever)

This week's prompts are:

Casanova

and/or

Venice