Observation one: Hermione's Physical Development. A huge part of physically develops throughout puberty, is the arrival of sexual feelings and thoughts. Throughout the books, Hermione and Ron become a lot closer emotionally and in the end of the series, they begin to get closer intimately. They fall in love after many years of being best friends. During sexual development, females also develop breasts and widening of hips. This type of development is seen throughout the years.