My kid has autism, and exhibits a similar behavior. What he really likes is the running water, and when we introduced him to showering, oh my god, he's in love

My kid has autism, and exhibits a similar behavior. What he really likes is the running water, and when we introduced him to showering, oh my god, he's in love. Showers are a lot more efficient than letting the tub run full blast, and we set a timer so we're not the ones telling him when to get out -- sometimes he rages at the timer, but it subsides quickly because he knows he can't bargain with the timer.