Please only read further if you have triggers, otherwise you will seriously spoil the book for yourself.
Firstly, I will list what triggers AREN’T in the book so you can stop reading in order not to spoil it: No rape, non-con, purposeful harm done to the FMC by the MMC, torture, suicide/self-harm, death or detailed grieving over death, ow/om drama, abortion, pregnancy, mental/emotional abuse, incest, drug/alcohol abuse, or child harm.
Please consider stopping here if your trigger has been detailed above as the rest are spoilers.
There are some depictions of depression and mental health. Childhood trauma. Memory of loss of death. Vivid memory of bullying and violence within a school featuring young children, with an emotional attachment to the perpetrator.
As always, my books have gore.