Ginny Watson 
Keeping His Dirty Secret [EPUB ebook] 

April worships her friend Rick, they are as close as brother and sister despite not being related, so when she senses that he is distracted & starting to drift away she decides she has to find out why. Standing at his door she hears a sound, a girl in the grip of climax, & then she realises he locks himself away to watch porn.. but she is about to get a shock when she asks him what he watches.