Playing Sims but don't write stories

Most of the time I just play in the moment, and to how I see my Sims's personality and what they might do for fun or activity. If I do have a story in mind, it's still open to being changed by spontaneity or random happenings. I like it better when the Sims guide me to how the story will play out. I look for clues and cues as to what I think they want to do or who they like or don't like. Sometimes I'll want a specific Sim to, say, become a Vampire or something but Vampires just aren't drawn to her, so she remains a mortal and her story changes. I don't like to force things in my game, I like them to play out as they will.