Watching porn on my computer will not be tolerated young man! With that notion, it looks like I have to take matters into my own hands by only allowing you to wank under my supervision. With my permission you will be allowed to wank but you must receive a spanking afterwards. If you still get an erection while being spanked I will have to truly punish you by inserting the bottom end of my wooden spoon into your anus, encouraging you to jerk your penis. Once you have ejaculated I will then scold you and instruct you to clean up the mess and go to bed early.