My pulse quickened and my stomach tied itself in knots as we drew nearer and nearer to our destination - a mixture of nervous excitement and trepidation running through my body. I knew I'd signed up for this and had long fantasized about going where we were going, but I couldn't shake the nerves. It certainly wasn't going to be my first time doing it, but this was different. This time I wasn't doing it just for myself or the person I was with. This time people from all over would be watching.

I should probably step back a bit and explain a few things at this point. As long as I can remember I've had a thing for mud. Bit of a weird one I know, but the minute I feel the soft, dirty touch of mud on my body I go wild. I had been lucky enough to have had a girlfriend or two that was willing to indulge me (one of them even grew to enjoy it herself), and had even had a couple guys that went with me, though the most I ever had done with a guy was kiss one of them and sort of help get each other covered before jerking off together. About a year or so before the day in question, I found a site called DirtyGuys that produced videos of guys doing all sorts of filthy things - particularly things involving mud. It didn't take long for me to buy up almost every film in their archive and wank myself raw watching them over and over. Fast forward to a month before that day and in a slightly drunken and extremely aroused state I sent in a photo of myself to be considered for a film. Two days later the owner of the site, Dan, emailed back with the date and location for a screen test.

So there I was, walking alongside Dan and helping carry camera equipment to a mystery spot outside of town. The weather was good to us - after a few days of rain earlier that week the sun was shining and the air was just the right temperature. By the time Dan said we'd reached our destination, though, we were both a bit sweaty and out of breath. But the minute I saw the mud in front of me, I knew the trek had been worth it. The mud was a perfect shade of brown and had a mild stink to it that teased at my nostrils and made me want to dive in immediately. The expanse of muck appeared to have been a pond or the edge of a marsh at one point, but now there were only a few tiny puddles of rain water left scattered across the surface.

"Told you I had a good spot," Dan said with a smirk as he began preparing his camera gear. "Been wanting to test it for a while now and figured I'd give you and the spot a test at the same time."

"Yeah it's- I- um- uh- do I?" I stammered awkwardly, the mixture of arousal and nerves getting to me momentarily.

"Bit nervous aren't ya?" Dan chuckled. "Don't worry about it, all you have to do is enjoy yourself like you would if you were here alone. There's a little flask in that bag over there if you want a little nip to calm your nerves."

"Thanks- yeah I think I will," I said awkwardly before finding the flask. There was only about a shot or two of whiskey in it, but it was just enough to help steady me a bit without getting me tipsy. "So, um, what happens now?"

"Well why don't you take a look around in that bag, see if any of the clothes in there catch your eye. Or you can just go nude the whole time if you'd prefer." As he spoke, Dan continued setting up a tripod and camera before placing two more cameras around the edges of the muck.

I took a moment to go through the options in the bag before finding a really nice pair of designer boxer briefs buried near the bottom of the bag. "So- um where do I change?"

"Right there is fine. Might as well get the barrier broken now instead of on camera right?" Dan replied without looking up from the gear he was fiddling with.

"Oh, yeah I guess that make sense." I stripped down and took a moment to get comfortable with my nakedness. It wasn't my first time being nude outdoors and it wasn't like I didn't shower with other guys at the gym, but somehow it felt different this time and I could feel Dan's eyes on me. After spending a moment calming myself I slipped into the boxers and turned back towards Dan. "How do I look?"

Dan was already eying me when I turned around. "That's a good look for you - can't wait to see how it looks caked in mud." A surge of arousal shot through my body and I felt my cock twitch slightly at the mention of what was about to happen. "Cameras are all set up. You ready?" I nodded nervously. "Alright then, stand right over there and face the camera. I'm going to ask you a few little questions once we start rolling, then we'll get down to business." He indicated a spot on the opposite side of the tripod and turned the camera so the lens was pointing towards it. I stepped around the gear and positioned myself in front of the camera and stood there nervously, the reality of what was about to happen fully hitting me.

"Okay here we are with our newest dirty guy, getting ready for a little screen test," Dan said when the red light one the camera had turned on. "You a little nervous?" I nodded. "That's alright, most of the guys are their first couple times. This isn't your first time getting dirty though is it?" I shook my head sheepishly. "I didn't think so," Dan chuckled. "Give us a little turn, let us see you a bit in those boxers." I turned around slowly as Dan zoomed the camera in on my crotch, capturing the black satin fabric hugging my crotch and ass. "Great, now it's about time you got in the mud, don't you think?"

I gave the camera another nervous nod and began stepping toward the edge of the muck. When I reached the edge I paused a moment, took a deep breath, and took my first step in. The mud was soft and sun warmed and I couldn't keep from letting out a shuddering gasp as I felt its teasing slimy touch against my feet. A few more steps and I was halfway up to my thighs. The mud was much cooler beneath the surface and its silky caress against my exposed skin had my cock leaking pre-cum into the fabric of the boxers I wore. I stopped and groped myself, sending waves of pleasure through my body.

"Go on, wallow around," Dan encouraged from behind the camera.

I dropped to my hands and knees and began crawling around in the muck, the soft stink hitting my nostrils even harder and turning me on even further. I quickly found a spot that suited me - just the right consistency and with a stronger stink than before and laid myself down into the muck, letting out a moan of pleasure as I felt the mud squelching around even more of my body. I rocked myself back and forth against the slimy mud, sinking myself ever so slightly deeper. After a moment of that I rolled onto my back and squirmed about, leaving me fully coated in the perfect mud from the neck down. My hand slipped down the front of the now completely mud soaked boxers and began rubbing my stiffening cock as I groaned in ecstasy.

"Take them off," Dan instructed. Without a moment's hesitation I tossed the ruined boxers aside, my inhibitions going with them as I slopped muck onto my cock and began stroking myself with the mud. "Now show us your muddy ass." Again without hesitation I obeyed, rolling over again and lifting my hips up to show the camera my now mud covered ass. In my new position my face was just barely above the surface of the churned up mud - every breath filling my nostrils with the delicious stink. I took a deep breath and pressed my face down into the smelly mud, my ass still raised and pointed at the main camera. The muck oozed around my face, welcoming it with its filthy embrace and I almost came right then. I fought to control myself but couldn't suppress a piggish grunt as I rubbed my face in the muck. I kept my face planted in the muck as long as I could, quietly grunting until I had to come up for air.

"Turn around and do that again for the camera." Again I obeyed, eagerly turning and pressing my face into the soft smelly muck. Without even realizing I began grunting again as I made a show of rubbing my face down into the mud again. "Do I hear a pig down in that mud?" Dan said tauntingly when I lifted my face from the muck and looked up at the camera. My eyes widened at his words, realizing he'd heard me. "Don't be ashamed, we're all pigs here," he continued, still teasing me. "Now get on your back and oink for us."

I was far too turned on to even consider refusing and quickly rolled onto my back and began oinking at the camera as I stroked myself. My free hand smeared more muck all over my body as I did, until I found in straying between my legs. Before I knew it I was teasing my fingers against my hole, oinking and moaning even louder at my own touch. I'd never tried it before but as I laid there, looking up at the camera, oinking like a pig and stroking my cock, I used the mud as lube and began fingering myself. I cried out at the feeling between oinks, my stroking getting faster and faster. I craned my neck to look down at myself, one hand around my muddy cock and the other between my legs. The sight was enough to push me over the edge and I came harder than I ever had, my hot seed shooting out hard enough to splatter against my face and coat my chest before I collapsed into the mud, panting heavily as the feeling of afterglow flowed through my body.

"Well goddamn, that was one hell of a show," Dan said, pulling me from my post orgasm reverie. "I might even have to put this screen test up it was so damn good."

I looked up at him behind the camera as I tried to catch my breath and gave him a bit of a grin. "So I guess that means I passed the screen test?"

"You definitely did," Dan chuckled. "We're going to have a lot of fun with you. Welcome to your new sty pig."