I have to double down on Field of Dreams as it is an amazing, uplifting story.
Some others:
Practically Married by KatherineKent (pretty funny)
Lois and Clark are practically married but don't realise it. Family Man by StopQuitDont (has quite a bit of humorous moments)
With the help of a Christmas visitor, a very different Clark is shown what his life could be if only he will allow it to happen.
Valentines Cards by Bob Bartholomew (nice and touching)
The Lane sisters have a tradition of shopping for Valentine's Day cards. This year Lois has a story to tell about buying a card the year she dated Lex. Telling that story may lead to progress in a relationship with much more potential.
Mike