Even though Aria had entered the house, she still worried about dirtying Lucas's home, so she took every step cautiously, careful not to make a mess.
Inside the house was much warmer and the air was fresher than outside. Because of this, Lucas felt much more comfortable. Seeing how careful Aria was being, he said again: "You really don't need to be so cautious here, I should be the one thanking you, not you feeling apologetic about dirtying the place."
Although what Lucas said made sense, Aria still felt that people's moods could easily get spoiled by small things. If Lucas felt fine now while she was here, but got upset after she left, then only he would have to suffer in her absence, which would be somewhat unfair to him.
