Sounding

I have tried sounding a few times, and I really love the sensation. I do it very gently and slowly and use plenty of surgical lube and a sterile sound, but every time I have a burning sensation afterwards, when cumming or peeing later. It's uncomfortable enough to make me not want to do it again.

I was wondering if anyone has some advice or tips, because I really want to try more. Does it get better eventually? Should I do it differently?

Looking forward to your replies, thank
The more you practise, the better it gets.
Now just with a bit of saliva it slides down thanks to gravity !
I immediately urinate just after practising, to clean my urethra.
I must say, I appreciate a little burning sensation when I pee.