What has made you fall in love before?

The kind of love that you guys tend to have to give is one of my favorites. The internet has a lot of explanations of what's to expect from an intj, but not enough of what has actually made you guys fall in love. I know this will be personal and individual, but I would still like to know. But don't tell me your prerequisites or demands, just tell me examples that already happened. Tell me stories, and be detailed all you want. I love details. And I love love stories.