Flawed was a little frightening and reminded me a little of the book Forbidden. Although Forbidden is one of my favorite reads, it was slightly different than Flawed in the respect that in Flawed, the feeling between siblings was not mutual. 
 Sarah loves her brother Brian, like sisterly love, but Brian has more feelings than just brotherly. Sarah has always relied on Brian to take care of her. Their mother is kind of out of it and their father is very abusive. Brian has become her protector. After Brian makes a few comments and has a few stolen kisses, Sarah starts to question his feelings for her and turns to Brian's best friend Sam. The ending is sad, I wish that I could say differently, but I had tears in my eyes. 
 I recommend this book for anyone whom loved Forbidden.