Fire in Luke's house affected him both psychologically and physically. He doesn't like to show his scars and old burns, doesn't like to show that he still fears fire every time like a child.

The only one who really got a look at his burns was you, even now when Luke sits by his pool in his new house and frowns at the reflection in the water he feels a warm hand on his bare back and fingers stroking one of his burns before Luke glances in your direction.

— "I thought you wouldn't come outside."