I like shounen-ai anime and manga but I have a baby brother?

I'm obsessed, addicted and I love watching and reading shounen-ai animes and manga I like soft-yaoi but if it's categorized as mature I don't dare to read it. The problem is I have a 7 year old baby brother and he keeps on pestering me and looking at the pictures of the manga... Will this affect his brain or something should I not let him see it? What should I do?