Violence is never the answer.
Unless he's a richard then beat the stuff out of him.
Violence is never the answer, but ultraviolence is a good solution.
You're both young teenagers still so I've got a good resolution to your problem:
Spend some time strength training and practice pinning people down. One day when he is alone, and make sure no one else sees this, take his hand and pin it against a railing, slam it in a door or locker, or whatever just keep him locked down and preferably in quite a bit of pain. You'll need to be strong because he is going to fight back but use your body to keep his other arm in place and wrap your hand around his neck against a wall.
Now here is why you want absolutely no one to see what happens next, with your hand strangling him wait just a bit for him to subside and reach in with your head, making sure to not break eye contact, and give him the deepest tongue filled kiss you can muster. As you break lip contact keeping just a thread of saliva dangling between you two move down to his neck grazing over him with your lips and the tip of your tongue. With your grip crushing him give him the biggest nastiest hickey imaginable right on his neck, somewhere he can't easily cover it up. It should there for at least a week. As you finish look at him in the eyes once again, glare at him with your fierce determination and let sink in what just happened. Then, push him back firmly and let go. Walk away confidently like nothing happened. This should all happen in less than a minute, 30 seconds even if you're good enough.
Now back to the point of you being teenagers, you've got a flood of hormones and are still figuring yourself out loveually. You've shown to him that you are physically and loveually dominant over him and he will be confused, conflicted even. The physical pain he will have felt from the struggle is a lasting reminder of your power over him and that hickey will be a visual for both himself and everyone else too. As he tries to cope with what happened he will brag to his friends that he received it from an upper class girl, possibly at another school. Make sure to be visible to him while he is socializing with other friends, when you know he is talking about it look over and make eye contact, giving him the same glare from when you administered his punishment. When passing in the hall make a gesture towards your neck, again signaling a reminder to him what happened. Soon he will be unable to cope anymore with what has happened to him. He will be confused loveually, he has had to lie to all his peers about how he was emasculated both physically and loveually by you. He can't tell anyone the truth, it sounds like a sick fantasy on his part and he will be targeted for his homoloveuality.
Eventually, after all the trauma of the altercation, the lying, and constantly being in contact with his abuser his mind's thoughts will drift towards Self Delete. He will be confused emotionally and loveually so he will be at his weakest. This is where you make your final move, as he is teetering on the edge of taking his own life make one final act of aggression. Again, when he is alone, assault him even more violently this time. Get him from behind, groping furiously while biting his ear. Whisper into his ears messages about how weak he is, how much of a loving friend he is and how much he must be enjoying this. Completely shatter any sense of strength or manhood he had left. If you do this on a Friday after school I guarantee over that weekend he will commit Self Delete.
