I have to admit that there were a few times that made me a little uncomfortable, but that didn't forbid me to enjoy the story. Usually I am not into gay novels but "Sinister" is quite interesting. I couldn't help but to link this story with "I know what you did last summer" 😄
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I think I am getting too old for highschool stories as I just didn't like how easy Ashley "jumped" at Levy, or how normal is seems for all of these highschool kids to have sex. They just seems too young (I'm 28) though can't say that back in my highschool days we were innocent.
I would've like if you had build Reigns advances on Levy a little slower. It was explained that he had feelings for his brother for years before the story took place, but still him coming at Lev so boldly already in the first chapter was too fast for my liking.
I liked that you kept the mistery of the killer through the whole story even. Usually there are that one person that seems super suspicious, but then turns out that he isn't the guilty one, but in "Sinister" no one is more suspicious than others. It could be anyone - Reign, Lucifer or even oh so understandable youngest brother. All of them have the same level of suspicion.
Overall the story was enjoyable and interesting. Some things I would have written differently, but this is your story and your fantasy.