I liked your Diane and the recurring motifs (the coffee, testing, the hair coming down) a lot. It might have been stronger if you'd held back on the declarations of love - I would tend to agree with the Peregrine's review on that.

I cant stop smiling!
... it was good, a little "cursi" (dont know how to write it in english), but i liked it!
How about you write some more?? ;)
Ps. I promise i'll look for that word in the english/spanish dictionary!

Aw, that was cute. It was a really nice story to read.

Hurrah! So glad you posted this here!

This was really sweet, and I seem to remember reading it before. Nice characterization on your part.
A couple of minor nits: if you follow canon, Jake and Diane really aren't far enough along to be in the hearts and flowers phase, so I view this as more of a fantasy.
Also, the structure of your story is a little rough in places. There are no scene breaks, so some POVs shift radically. There are also places where you should join the action with the verbal part (actually, there were a lot of occurrences like this).
Other than that, it was a delight to read. Thanks for writing and sharing this with us.