Shower with a friend

How do routines start? When we moved to this house Dante got it into his head that he had to shower with us. Eventually we installed a plastic garden chair in the shower so he would be more comfortable. Now every morning when we get up he makes a bee-line for his chair and waits for the water to start. He then studies the patterns of waterflow on the mosaic tile floor and gets really excited when the shampoo suds go down the drain.