One possible fanfiction could be set in a magical school where Harry, Shamal, and Gokudera are all students. They meet in a special class that combines magic and combat skills. Harry, with his knowledge of magic from his own world, could share some spells with Shamal and Gokudera. Shamal, being the more spiritual one, might introduce them to some unique forms of energy manipulation. Gokudera, with his combat expertise, could teach them self - defense techniques. They become friends through their shared experiences of learning and growing in this new and strange school environment.