I am 19 and have been in similar situations when i used to drive my beemer to High School. First off you dont want him to do anything serious to the car. How to go about that...make sure he knows its serious and u dont like him touching your car. This mainly happens for the same reason cars get keyed ...Jealousy. But let someone know so if something does happen he will be liable. Also, Read "Art of War".
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