Sometimes, a child may be confused if they experienced positive physical pleasure, arousal, or emotional intimacy from the abuse. This confusion can make it difficult for the child to speak up.
A child may feel that they permitted the abuse and should have been able to stop it. Remember that there are no situations where a child is responsible for any sexual interaction with a more powerful child or adult.
People who abuse children may offer a combination of gifts or treats and threats about what will happen if the child says 'no' or tells someone. They may scare the child with threats of being hurt physically, but more often the threat is about what will be lost if they tell e.g. the family breaking up or someone going to prison.