Tasteless, shameless self-pimp here, Mariana, but I think my story, Solstice might fit your criteria. I won't compare it to the wonder of Constellations, but I tried to make it a fairly realistic representation of how Clark/Lex go from being friends to more and the resulting aftershocks. I agree with what you and Rhi have said so far about what you don't like in first-time fics. Yeah, PWPs w/est. rels. are animals of a completely different color. Thank God.