What did sophie imagine about her brother geoff's life at his work place

Sophie is described as a fantasizer who dwelled in her​ own world of imagination. She confided in her brother Geoff and imagined that there are spheres of his life she did not know about. She also thought of him to have friends and visit places beyond her reach and envied his silence. She hoped to be admitted deep in her brother's affection and imagined going to the city with him riding on a horse wearing yellow dress with a cape and his brother wearing black leather.She was fascinated by the idea.