For this technique, you need a handheld shower massager. With the shower head removed from the holder (so you can reach it), kneel down on the shower floor. Sit back, so your buttocks cheeks are on the heels of your feet. Lean back to lift you knees up off the shower floor. This will spread you buttocks to open the anus (if you are less limber, keep knees on the floor and press outward with each heal to accomplish the same opening of the anus). Now aim the shower massage stream at the anus. Sure to bring a hardone as the butt hole is tickled by the water stream. Rotate the massage spray around to stimulate the anus and ball sack. When as hard as needed, lay back in the shower, put feet up on edge of tub near faucet to provide easy access to ballsack and anus. Lube up your penis (I have found hair conditioner to work well-and no extra lube to bring to shower-just don't use all your mates hair conditioner or you'll have to explain where it all went). Circulate the massage water stream between the ball sack and anus, while stroking with the other hand. Sure to cum quickly-a great start to a new day. And no extra cleanup.
If you only use the hair conditioner for stroking lube, an extra bonus is a reminder of the morning shower fun each time you retrieve your penis for routine business during which releases some of the scent of the hair conditioner trapped down below.