I moved to Florida a year ago from Maryland. Up there I had a couple good mud spots I'd played in a few times, so after moving I made finding a new spot a priority and finally hit paydirt. And what a find it was, tucked away in a corner of a park within walking distance of where I live no less! It's semi isolated and there's water right nearby for cleanup. I found it during the day so I couldn't do much other than poke my feet in a bit, but it felt good and the park isn't closed off so technically it's always "open". A few nights later, I set out about midnight and slipped my way in. I kept an eye out for anybody lurking around and not seeing anyone I headed for my spot. I stepped in slowly to test the depth and I was knee deep after two steps. I was wearing shorts and a tshirt, but I prefer being as unencumbered as possible when I get in mud. The mud was nice and thick and a bit peaty so it took a little pulling to get my legs out. Once I had my clothes off I got back in. The mud got deep after a couple more steps and it was up to the tops of my thighs. Moving forward after that was hard but worth it as I slid in up to my waist. The mud settled tightly around me and I couldn't feel a bottom. I squirmed, working my way in a little more. I'd already been a little aroused before my hips were swallowed, but now my cock was rock hard. I pushed my hand down and grabbed it and started stroking, working against the thick mud as I sank up to just below my chest. I pleasured myself nice and slow, enjoying every moment of being surrounded and held. My cock was throbbing in my hand and I finally came so fucking hard with one of the best orgasms I've ever had. My body shook crazily, making the mud slurp at me. I stroked a bit more before stopping for a breather. The mud was tight around me and after a minute or two I did a test struggle to see how difficult it would be to get out. It was gonna be tough because I didn't have a solid bottom under me but as I moved I started getting hard again. It felt so good I just stayed where I was and started masturbating again, cumming after about ten minutes. I relaxed for a while when I was done before starting to work on escaping. I think it took me about 15 minutes before I finally crawled out, a thick coating of mud clinging to me that I scraped off. The short walk to the water and cleaning up felt nice too, it was a humid night and I was sweating a lot but the water was cool and a slight breeze kicked up. Then I went back to the mud to collect my clothes and flip flops. I took my time walking home and while doing so, a few cars passed me on the street, including an unmarked police car, but it didn't stop so I got home uneventfully. I've been back once more since then and I'll definitely be making a habit of it.