I like to think that Evie doesn’t have much opportunity to masturbate on the train, what with so many people on there all of the time and sharing a room with Jacob. When she’s in the mood, she’s taken to getting comfortable and touching herself on rooftops or in small, dark alleys at night. She does it so often and so gets off on the idea of the possibility of someone catching her that soon, she can’t get off at all unless she’s in some sort of semi-public place.