This is absolutely beautiful. I adore the sweet, kind of romantic feel to it. I like it the way it's an awesome self-contained drabble; just giving you a little insight into their relationship - but at the same time, it also left me wanting to know more. I think that's exactly the way a drabble should be. Your sentence structure is really good and where you had to restrict your words because of word count, you did it well. You made it enhance the writing style, instead of take it away.
The only thing I noticed (and this may have been a typo) was that the its in the middle of the second paragraph, should be it's, as in it is. Without an apostrophe, it's possessive. x]
I love you use of paragraphs, as well. The beginning is a perfect, minute introduction and then you have the bulk of the scene in the center, with a tiny conclusion. A mini one-shot.