As we all know, the title is in Latin.

I chose this languace because of the spells of the series.
I adore magic spells and I think that they're an important component of the magic world of Harry Potter, and not just for the characters but for the story.

" Tempori serviendum est " means " Let's need to be servants of the circumstances ". It's a quote from the Epistulae ad Atticum , X, 7, 1 of Marco Tullio Cicerone, and I think that this phrase describes very well Lucius & Narcissa's minds and hearts.
They're devoted to Lord Voldemort and their relation borns because of him and the circumstances to be pure-blood magicians. But This is even the most important difference between them and all of these aspects are the bases of their relation, so I think that this is the best choise I've could made for their fanlisting! :)