I know there's a fic where Clark is speaking with Jack on Clark's balcony, the night before Lois gets married to Luthor. Jack asks him, "Why don't you just go to her as Superman?"

Clark replies something to the effect that Lois has to choose on her own.

I forget who wrote this fic - was it Nan Smith? Or maybe it was Caroline K's "If I Were You"? Can anyone remember this?