There were times when Belle was scared and anxious that Lucas would not be by her side forever, as if one day when she would wake up, she would not find him next to her and would have disappeared. She didn't want to come out to be clingy and therefore she turned away from him to look at the small window in front of them which could be moved to speak to the coachman.
Lucas was a death reaper first who had not known what emotions were but with the years he had stayed here in the Adams' mansion, a sense of attachment had been created which sometimes bothered him. A reaper wasn't born with emotions, at least not the ones who were at the lower chain of the food chain in the realm of the dead. Grims had a possibility when it came to emotions as they were much higher compared to the others along with a few low reapers. If they didn't then the emotion to thrive for power wouldn't have existed.
He noticed how Belle held both her hands on her lap.