It varies. In certain comic arcs, Lana Lang may face life-threatening situations but doesn't necessarily die. The fate of her character can change based on the creative direction of the writers and the demands of the story.
Lana Lang is a character in DC Comics often associated with Clark Kent (Superman) from Smallville. She's been depicted as a friend and sometimes love interest of Clark.
It could be Clark. Given their on - again - off - again relationship in the show, it would make sense for Clark to be the father. Their relationship has always been complex and a pregnancy would add a whole new layer of drama to it.
Lana Lang did not marry Lex in the comics. The comic plots didn't lead to such a union. Their characters had separate developments and romantic involvements.
A great Smallville Clark and Lana lemon fanfiction might be one where their relationship is put to the test by an outside force. For example, a powerful alien entity arrives in Smallville and tries to drive a wedge between them. This could lead to some really intense and emotional scenes between Clark and Lana. Another type of fanfiction could be a coming - of - age story for their relationship. It could start from when they were just kids with a crush on each other and follow their journey as they grow older and face different obstacles. And then there are fanfictions that focus on their shared dreams and how they try to achieve them together, like Lana's dreams for her career and Clark's dreams of using his powers for good, all while being in a relationship.