The Sims Wiki:Player stories

Everyone plays the sims differently. Not only is it a game without an ending, its a game in which you don't have to follow a plot. Why should Cassandra marry Darren, when Daniel Pleasant is much more interesting. Why should Nina be a romance sim, when you know she's just longing for grilled cheese?

So on each page of pre-made sims and families there is a section at the bottom called 'player stories' in which you can talk about your sims to your hearts content.