Two of my favorite stories are "what if".

What if when Lois told Superman she'd love him with no powers, Clark couldn't let that comment go?
If I Were You by Caroline K

What if the bullet that Clark was shot with in "That Old Gang of Mine" was made of Kryptonite?
Death in the City by Dandello

Perry: (To Lois) Honey, this could be greatest story since Superman came to town. By-the-by, where is that husband of yours?
--Faster Than a Speeding Vixon