I can just imagine the awkward little scene had he caught you. Mum had given up policing my reading by the time I was 13, but I had a strong intuition for mind preservation, and the most shocking I went into before 18 (beyond some very mellow, quasi rape apologetic harlequins) was The Shinning I think, and boy, did reading that one serve me right. It certainly stopped my prepubescent craving for cheap horror, having found the real thing. Now I'm a sucker for the true monsters inside the human fantasy, though I occasionally trip in surprise by what can be found.