You reacted splendidly in this situation! You responded to Dennis’ question and explained things in an age-appropriate manner. Dennis is content with the answer. When he has further questions, he will probably turn to you as his reference person and ask you questions in full confidence.
Dennis learns that the body is not a taboo zone, and that it is possible to talk about it entirely normally.
Your approving of his natural curiosity is the best foundation for a healthy development of his sexuality.
