I have a short hose and anal nozzle hooked up in my bath so when I want to play I get the water temp right for my asshole then shove the nozzle up my asshole until I am full and I flush into a bucket. I do this several times to try to be fully clean esp if I playing with someone. I don't worry about a bit of crap on my toys. Or on a guy's cock if I didn't flush well enough. It's easy to clean a dirty cock.
Actually, it was in the middle of winter on a sunny day. It was cold. When it's warm water, it opens the inner sphincter and starts to fill me inside. I only do that when I plan to play for the day. I usually take about 3-4 litres in to get a full flush. It takes a while but the end game is worth it as there is usually nor crap on my toys.
That was amazing mate, thanks for posting it, love that feeling of flushing myself out like that. I'd love to be there with you getting showered by it!