Well there's the general ones r/pee, r/peegonewild, r/piss, r/pissing, r/2pee4u, and r/watersports but if iirc some or most of those are exclusively for posts of women

For pee content of men there's r/guyspeegonewild and r/ladybonerspeegw and I think I saw your vid on r/GayWatersports

r/omoshiroi is hentai pee

And lastly there's r/fullbladder for holding

I'm sure I'm missing a few but if you search for "pee" "piss" "watersports" you'll definitely find a couple more.

My own personal opinion is I wish the subreddits were more trans inclusive, theyre often exclusively for posters of one cis binary gender or the other and the rules for trans people are either a gray area or just not allowed. The only trans pee subs I could find were one that's dead as hell and one that's exclusively for trans women, but uses really derogatory terms all the time and even in the freakin bio.

Anyway, my rant aside, hope I gave you at least something you liked!