Perfection [HP fanfic drabble - HP/DM - PG]

A.N: Written for petulantpoetess LDWS Week 1.  Many thanks go to my beta celestlyn. Any errors are completely down to me.
Prompt: A determined search for the perfect cup of coffee leads to an even more satisfying discovery.

Unfortunatly, whilst I wasn't voted out after this, I became too busy to write the drabble for week 2, so had to drop out of the competition. Oh well.