This work could have adult content. If you proceed you have agreed that you are willing to see such content.
To save Lois's life, Clark makes a bargain with Lex. Complications ensue. R for sexual situations and Lex being a big jerk; also (mainly offscreen) violence. If you think things like mating bonds pose issues of consent, then there are definitely issues of consent here, though not exactly mating bonds. Well, Lex in himself is a walking issue of consent, isn't he?
I should probably mention that I'm ignoring much of anything past S5.