Yo I have an idea...for your story since you need help :D
But first if the boys were talking about reader~SAN than maybe natsu goes over to reader and asks if she's/He's ok and who did it to her/him in private and secretly lisanna was eavesdropping and she pulled to the janitors closet you never know there might be one next to her locker.anyway lisanna pulls her in and beats her up with her little crew I forgot if she has one anyway and she beats her up...Natsu confronts lisanna and yells at her to stop hurting reader San and Lisanna runs away making plans for revenge ;) this could be a good idea...I'm not the best writer but yeah