Here goes it, Eren's hands are scarred from trying to save his mom and further injuring (by accident or on purpose, writer's choice). Reason as to why Mikasa's aren't as scarred, also writer's choice, but basically someone in the 104 squad sees his scars, how do they react? No one specific is in mind, though Armin or Mikasa aren't preferred. No ships or anything, just someone noticing and maybe asking about them, and maybe has a slight change of perspective of Eren. Link: http://snkkink.dreamwidth.org/2124.html?thread=2381644