I remember having two distinct fetishes at a young age: destroying underwear and peeing. I used to sleep over all the time at my best friend's house (we looked and acted so alike that teachers often confused us). We were practically the same person. We were the kind of close that when we'd go camping, if I got scared or saw a spider or got cold, they'd unzip their sleeping bag and have me crawl in and share. So naturally, I shared my secret kinks (they hadn't started puberty yet and didn't get the fetish part, but still thought it was really fun--I was a really early bloomer). I don't remember specifically which one was my first naughty pee, but I remember us wetting our underwear during a "you touch me, I touch you" in their treehouse, them wetting their pants to make me feel better when I wet mine during an SOL test (gray sweatpants--it was completely visible and all over), wetting their bed together, wetting their living room carpet when we slept in the living room one night, peeing on each other (also in the living room, and in the shower too). The few times their little brother caught us, he never told because my friend threatened to beat him up (also because he liked me and I got him to do some stuff for us, like hide our torn up undies under his mattress and pee his pants for me once). I'm actually amazed we never got caught or in trouble, or at least their mom never said anything.
Although most of my naughty pees these days have been solo, there was a time when I was really scared to in my house because I had helicopter parents, so I used to basically do it at friends' houses with them or in my dorm with my partner. I've really only started peeing solo recently.