Crossover: The Making of My Sadistic Disciple

[Minor revisions] It's been so long since I last wrote that I've forgotten some of my ideas, so I'm making a few small changes. En Sang is a man who travels through time and space, journeying between worlds. He's always stuck to the rule of one person per trip, until that lousy System tells him to take on an apprentice. The wheel of his fate begins to turn. But what he never expected was that after he went off to have fun in other worlds, he would come home to find his own disciple had turned into a total psycho. This is my first time writing a novel, so please be kind. The protagonist is the gong, and the pairing is with Reborn. Reborn won't show up until a bit later, though. I've always wondered how tempting Reborn the Demon King would be as the shou, but it feels like no one in Katekyo Hitman Reborn! could keep him in check, so I created my own character. P.S. Some characters may be OOC, so please share your thoughts!