To continue with the idea of writing with emotion, remember that if your readers are looking to identify with the characters you must make sure that they can see themselves reflected in your characters.
As far as the type of story you have chosen, some of the greatest short stories have developed around the same old topics: relationships, loss, and love.
This isn’t the important part. What? You think I’m crazy now? Nope, two stories can both deal with hardship and loss but, (here it come) they both have two different deliveries. Yes! One is dark and despondent while the other is light and humorous.
It doesn’t matter which you choose as long as your readers can identify immediately with your characters.