Flattery might be rewarded with the pleasure of one's company. However a trinket from your travels will seal the deal.

Surely France was not that dull. I had a delightful time while I was there during my travels - then again, I was not there to play Potions Master's whipping boy apprentice. You must tell me about it and in return I may indulge your curiosity about tales of my travels and my return home. I know you are dying to know the details.

Oh, and to answer your first question: Flint has undoubtably taken too many bludgers to the head. There is no other explaination for his lack of judgement and taste. But honestly, I always knew there were a few things wrong with him and shacking up with a Weasley - a Weasley Twin, at that - just proves it.