title says it all, invite him to a party one weekend but tell him not to tell his parents or dont invite anyone, tell him to sneek out and it will be the best party of his life.. meet him someone where no body will see him and lead him towards a hole you had dug before hand, get behind him and hit up with a sharp object, when hes down do it 2-5 more times to make sure hes finished and put the dirt over the body.
go to a lake or a river if you have one around you and dump your clothes in there (make sure you bring some spare in a backpack) and dump the sharp object in there as well, make sure you wash all the blood off.
When you get home take a nice long hot shower.
Be sure to make sure that ANYTHING you bring with you is thrown away, even the spare clothes.
but be sure to make sure no one sees you doing this.
or you could just ignore him and speek up for yourself.
if he trys to pull anything just tell him to F**k off.