My son is concerning me?

Ever since my son has turned 13 he has been acting really wierd towards me... He has told me that he wants to 'j1zz' in my mouth and would love to show me his glory hole. He has also keeps walking up to me and says "I have been thinking long and hard" putting emphasis on the 'long' and 'hard'. I am wondering if he has some type of speach condition where he mixes up words and says random words. P.S. Ever since last week i caught my son on my trousers. P.P.S. I walked into my room and saw my son naked on MY bed. He just looked at me and said hey you. He had a smile on his face and he had his hand on his stroking it slowly. I have come to the conclusion that my son is on some crazy drug but before i call the nearest rehabilitation center i want to know if im correct... Does anyone have any other possible reason for this? I am completely in the dark and im eager to know.