Hi Reevki! I'm a Special Education Teacher and have dealt with many children with this sensory need. It is very hard for someone to try and extinguish this behavior because, as you state, its an internal sensation that can't otherwise be acquired externally. That being said, my suggestion would be to PRAISE, PRAISE, PRAISE! Try giving the child lots of praise and rewards when he does go. Save the reward for something that is VERY important and motivating for the child. Make that the only time the child can earn this certain reward. In my classroom, we have students that earn a Hershey kiss when they go on the potty. If you make the reward for going on the potty, the student is more likely to continue finding motivation for using the potty. Make sure you pair the giving of a reward with lots of verbal praise, high fives, or a token for his chart. That way you will be more likely able to fade the reward, ultimately making the child see the benefit of using the potty in the correct manner. Hope this helps!