I've never really attempted to j/o in the shower, so I don't know, but I usually don't get a boner in the shower for some reason, idk. I've never really sat down in the shower either, but if I wanted to, I presume I could cum in the shower.
I'm way too high (too high too high)
To be feeling this dry and low
I'm way too tired, I've tried
I'm fired up and ready to roll