I am so very sorry you had to go through this. Since this is an anonymous site, I will say that I have been through very similar situations (although not as a teacher). I did NOT report it and I have always regretted that. You do not want to face these boys every day with them knowing that they got away with this and them thinking that it must be okay. You don't want to feel that you might have been able to prevent it if they do this or worse to someone else. No one is going to blame you. Please don't worry that a few days lapsed between when it happened and when you are reporting it. You are traumatized and ashamed (although you shouldn't be, it is a natural reaction). You needed a few days to process what happened. Please report it. I KNOW you will regret it if you don't. Again, I'm so very sorry that this happened.