u/Arrrrrrmmy

I’m searching for a book that was similar to Jenifer’s body. I believe I found it in this subreddit somewhere but for some reason it’s like it doesn’t exist anymore. The plot was a bit like this : a girl who either was a past friend of the mc or is currently (supposed to be Jenifer) gets changed into some sort of succubus and she goes around killing people at night time in their town and the mc decides to follow her one night and ruins one of her kills then they basically go on to forming a deeper romantic relationship. A huge part of the plot was that both of the main character live across from each other and can see into either one’s window and the character who is supposed to be Jenifer had a neglectful mother.
Please help