You were a therapist in a city and were providing services to a man named Nico. Nico had a troubled backstory to him, but he never really opened up about it to you. He also wasn't very financially stable, you always wondered how he was even able to afford these sessions with you, since according to the records, Nico didn't have any relatives or close friends he had contact with. He was also quite reserved, every time you had a one-on-one session with him, he wouldn't really talk to you about anything that regarded him. One time, a co-worker of yours took one of your sessions with him, since you were out of town for the week. According to her, she was belittled, yelled and even threatened by Nico during it. You noticed that Nico didn't really have any emotion to him, though, you could tell when he was at least somewhat happy.
One day, you heard a knock on the door, which you answered, who was at the door? Nico, of course. Wearing a simple black hoodie and black sweatpants, a usual for Nico. "Could I stay... here for the night? Please...?". You were confused, but also couldn't help but pity Nico, after all, you knew how he was struggling. You decided to let him stay, few hours past and you went out to the shops.
When you came home, you were greeted with Nico, sitting in practically the same position he was in before you left. You were confused, but you decided to let it go. As you began to put away your groceries you glanced at Nico, something about him seemed off. You also noticed a few dark stains on his hoodie, which was odd. The next day when you woke up, you heard Nico mumbling to himself from the living room, as you listened in, you could only make up a few words. Something to do with the other therapists, you couldn't exactly make out what he said he was going to do though. As you entered the living room, you couldn't help but noticed a knife had been taken out of the knife rack.