Dark Role Play Plot

Who is up for something really dark?

Trigger warning:

Stalking, death, murder, torture, ual violence, dark romance, power play, touch them and you die, mental control, mental abuse, Stockholm syndrome, abuse, indication of underaged relationships (I will not roleplay them but they will be indicated as A and B where underanged when they first met), any other form of ual and non-ual violence you want to add.

I won't reply quickly as I am on holiday but I have a plot I want to try. I am open to playing either A or B and any orientation:

It was 8 years since A moved away left their life behind ran and never looked back. They were only 16 when it happened not a day older. The night of her 16th birthday still burned into their mind the blood, the tears the pain. They remembered it all. Three weeks building up to that one night. Police, profiler and special investigation units. Nothing was left unturned until it all finally ended on their 16th birthday.

They had thought in their dumb puppy love pink world B would be the one they would love till the end. Choosing universities together, planning a year abroad, and dreaming of leaving for a different part of the country as soon as they turned 18. Everyone had envied their connection and their parents had loved B until the one faithful night on A's 16th birthday.

Three weeks of searching and turning their lives upside down leading up to the mistake that had cost B their life and gave A the chance to escape. Three weeks chained up in the darkness watching B hurt others and listening to B enjoying the trickling blood and screams of pain. Three weeks and finally the police were closing in finally the profiler had figured out who it was. Nobody believed them not the sweet little B they were such an outstanding and well-behaved student a pillar of the community. The sweet lover of A. Nobody believed them but they were right. Finally, they closed in and B in an attempt to protect themselves ended up giving A the chance to take faith in their own hand. The bloody knife was still in their hand, tears streaming down their face crying frozen in terror, B unmoving at the bottom of A's feet.

Now 8 years later A has finally started to move on. They are still visiting their psychologist regularly and still working through the three weeks of trauma but they are finally starting a new. A's parents packed up their life changed their names and left for a different country as soon as the trial had been finished to ensure A would be able to grow up without having their past loom over them. They had started need have her finish school in a place where nobody knew who she used to be.

A was underaged at that time so their face was kept out of the media. Nobody would know how they were. Nobody.

Until one day A is on their way to classes when suddenly a softly whistled tune reaches their ears. A tune they have long forgotten a tune nobody but A should know. It wasn't a popular song it wasn't even a song it was just a melody. A melody A had once before heard. A melody written by B just for A. So how could anyone know it? Nobody but A ever heard it. Nobody alive. B is dead. A killed B. But only they knew the tune.

Slowly the dark is creeping back into A's life. first the tune. Then letters addressed to their old name. Little presents reminiscing of the past. And the new dark mysterious pretty/handsome transfer student who seems to be interested in A and showing all the traits of a decent human being.

Does the new guy have anything to do with B? Is it someone else from her past haunting her? Or is it something entirely different?