Could it be A Conscious Choice but Wendy Richards http://www.lcfanfic.com/stories/1999/html/consciou.html

If I recall, the reasons Clark did it was different, but I do believe there is a scene with him trying to explain things to his parents in the story.

She was in such a good mood she let all the pedestrians in the crosswalk get to safety before taking off again.
- CC Aiken, The Late Great Lois Lane