Intentional Maladaptive Bx of Urinating

I hoping that someone may provide some insight regarding this. I have a 15 y.o. that recently began urinating on purpose. He usually does this to get back at me when I tell him no. I must understand boundaries and he cant always have his way. What should I do? I cant seem to find any resources pertaining to this online. Just bedwetting and that isn't his issues. 

He is on the autism spectrum.