How can I solve this dilemma? Help me!

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I am an amateur writer. I write short stories for children and also novels for adult persons. All my writing or creations are in my computer. My nephew whom I love very much is a 9 standard student. I dont want him to read those romantic descriptions of the adult novels that I have written and which are an essential part of the novel itself. I have one computer that we both share. Now a days he wants to read my works. I let him read the short stories but he asks me why I dont allow him to read all. I cant explain anything to him! I dont want tell any lies to him either! can anyone help me? What course of action or what explanation can I put forward to him for this?