Translation:Those who read a book to the boy, get cakes.
I think that "read a book to the boy" is more natural but at least should be an acceptable alternative. Also in Australia and England cup cakes are a specific type of cake and the word cake is not used solely for a big cake (e.g. fruit cake or some Gateau) but also encompasses small, individual cakes (e.g. eclairs, profiteroles baklava, cataif etc) they are all cakes and certainly not a cup cake (which is a small cake baked in a cup-shaped foil or paper container and typically iced).