Very well done. I think your writing is best/most powerful when you let the narrative jump into one of the characters heads, like you do here:

Jim looked around the office to distract his eyes from her beautiful body, but nothing else could catch his eye. It was just him and her now, alone in the dark office, almost exactly like last May...

So don't be shy about showing more thoughts-- that's the best part .  I'm not sure where you're taking this, but I would like to vote for the "Karen goes totally apeshit" route.

 Nice job.  Keep it up!