I had this kind of experience, too: I wrote a lot when I was a teenager and younger, but then not at all when I was in undergrad. I only picked it up again after a good 5 years or so. Talent just doesn't go away, though. All I can say is to try to relax and let the story come as it wants to. I tend to write very character-oriented things, so often it's just a matter of telling the character: "Ok, this is the situation, what do you do ok go!" I hope that this challenge can give you some good inspiration! :D