LMAO, what story? This game is a collection of Lex Luthor's infinitely hard dick fucking a bunch of hot chicks (occasionally some girl on girl stuff). There's no 'story' to be completed, unless you count little things like "Lex decides to hypno an island full of amazons so he can fuck them, and he does" or "Lex is confronted by Maxima, then goes back to her planet and fucks everybody".
There's no plot points, no arc, not even any real choices. Just clicking until you get all the scenes.
Now for me? This is not a complaint. I'm happy with it just being superhero porn, that's what got me interested in the first place.