My new girlfriend Nikki was the least inhibited woman I’d ever been with when it came to public displays of affection.

She would French kiss me at the mall or give my manly butt a squeeze right on the street.

I laughed one time when she was doing just that, then had to explain when she gave me a look.

Chuckling, I said, “It’s just I’ve never been with a girl who would just grope my ass out in the open like that.”

Nikki grinned. “I felt like giving your fine ass a squeeze, Dev.”

We walked on. It was a nice day and we decided to cut through the park on the way back to her place. I was hoping some mid-afternoon sex was in the offing. Nikki was freakin’ hot.

We walked hand-in-hand in silence a while, then Nikki, looking away, suddenly said, “Hey, now that’s some public displaying!”

I turned, didn’t see anything at first, then I stopped dead and gawked.

In among the trees about thirty yards off the park’s pathway, a man with his pants halfway down was moving rhythmically behind a woman who had her skirt flipped up onto her back. Somehow it took me a few extra seconds to understand and believe what I was obviously seeing.

“What’re they doing?” I said, stupidly.

“Can’t you guess?” Nikki laughed.

“But — but — out in the open like that...”

“They’re kinda hidden by the trees.”

“Then how come I’m looking right at them?!” And I was, watching the guy fuck the woman from behind, both of them standing, her hands braced on a tree trunk.

Nikki said, grinning, “Looks like they’re having fun.”

I had to agree. They were also giving me a serious hard-on. It’s not every day you get to gape at a couple fucking live. The path was empty except for me and Nikki, but others could come along at any time.

The man was speeding up, going into final overdrive it looked like. I stood there with Nikki and watched them finish, both bodies wracked by orgasm. Then they snatched their clothing back into place and fled away from us.

“Think we scared them off?” I asked, shaking my head in wonder.

“Dev, they wanted to be seen. Or at least wanted the possibility that someone might catch them at it. C’mon.” We resumed walking.

I was still staggered. “Where’d they find the balls to do that?”

“Some people like public sex. The danger. The risk.” She reached over and abruptly groped me again, this time briefly cupping my crotch. After that, we pretty much ran to her place and fucked like crazed monkeys until the sun went down.

But I couldn’t get the images out of my mind. I had no idea who those people had been, and they certainly hadn’t known us. Yet we’d witnessed them at their most private. The experience had been both anonymous and fantastically intimate at the same time.

It started to seriously arouse me. I’d never felt quite this way before. It was like discovering a new kind of sexual excitement. I replayed the memory over and over. I started imagining what it would have been like to be the man, fucking the woman from behind, in public, barely screened by the trees.

Things continued to go great with Nikki, like they had from the beginning. She was smart, funny, awesome in bed. But my obsession kept on growing, and I didn’t know what the hell to do about it.

She caught that something was preoccupying me.

“Is something wrong, Dev? This past week you’ve been...” She shrugged. “Is something going bad with us?”

My heart climbed my throat. I did not want to lose Nikki. I jumped in with bland reassurances, then realized I should just tell her the damn truth. She deserved to know, and I trusted her.

So I told her I couldn’t stop thinking about the park incident, how it got me totally horny every time I called it to mind. I thought she might get mad. But I’d underestimated her.

After a thoughtful silence, she said, “When you imagine it, do you picture yourself having the sex? Or is it the watching that excites you?”

It was almost a clinical question. I answered, “I’m doing it.”

“Then it’s not a voyeur thing. Good. ‘Cause I didn’t know how we might recreate that.” She grinned. “But if you want to fuck out in the open, where any stranger might happen by and see us, then I’m your girl. Let’s go fuck in the park, babe!”

Again I was gaping, just like on that afternoon when all this had started. I kissed her, then began grinding against her.

Laughing, she broke the kiss. “Save it for the show. Now let me get into a nice short skirt...”

She changed, and we went out, heading to the park. I was excited and nervous as hell.

The park was big. She surveyed the landscape, finally pointing toward the artificial lake with a stone bridge crossing it. She led me down to the lake’s edge, away from any paths. No one was around under the leafy trees.

She faced me and pulled me toward her. We resumed that kiss from earlier. Her lips parted and our tongues tangled. I pressed against her, and she backed up against a tree. My cock grew hard, and I rubbed it right on her. She ground back against me.

Nikki always excited me. But this was something new. Though we were under the trees, we weren’t completely hidden. She reached around and grabbed my ass. I groped her tits through the top she was wearing.

She reached down into my jeans’ waist and dug her fingers into the meat of my ass cheeks, which made me press my cock harder against her. Her hips bucked. We were kissing furiously now, wet mouths working together.

Her hands moved, sliding around my waist to the front. She undid my fly and pulled down the zipper. She’d told me to leave my briefs behind. I had.

My throbbing cock sprang into her hand. She gripped me tightly, giving me a few expert pumps. Excitement ripped through me.

I grabbed the hem of her top and peeled it up over her tits, exposing them to the air and daylight. I’d seen her breasts countless times, but this was special. I saw them in their full, pink-nippled glory, sweet luscious mounds.

I put my hands to them, squeezing. Her nipples were as hard as bullets. I tweaked them both, twisting just the way she liked it. She heaved her chest at me, moaning aloud. She continued to fondle my cock. My jeans were in danger of slipping off my hips.

I was aware of the breeze, of the rustling of the leaves, of the open sky above the trees. I felt a strangely delicious sense of exposure. It made my cock ooze a string of milky precum.

Bending down, I kissed Nikki’s tits, nibbling on those stiff nips. Then I went lower. She helpfully raked up her skirt and leaned back against the tree. She wasn’t wearing panties.

I put my mouth right on the drizzling slit of her pussy. Her taste stung my tongue. I licked her up and down, then delved inside, getting her deep hot flavor.

Her clit was a swollen bud, and I ran my tongue tip over it again and again. She growled, deep in her throat, and jammed her pussy on my face. Her hips jerked. She humped my mouth as I tongued her like a demon.

She came with a sharp cry and a flood of pussy juice, which I drank dutifuly down, not wasting a drop.

When I rose to my feet, she went down on her knees. Without a hesitation she yanked my jeans halfway down my thighs and put her wet lips around my thick cockhead. Pleasure raced up my body.

Her talented tongue swirled me, then she was sucking in my inches. I looked down, watching my cock disappear into her mouth. She took the whole veiny length of me, applying skillful suction, swallowing me right down to my simmering balls.

As her head worked up and down in a perfect rhythm, I started shoving into her mouth. She deepthroated me fearlessly, taking everything I had. When she groaned, I felt the hum of it. It added to my mounting ecstasy.

But I didn’t want to unload in her mouth, as much as Nikki likes to eat my spooge. She must have had the same thing in mind. Suddenly she pulled her mouth off me, stood up and turned around. She put her hands on the tree and pushed her ass back toward me. I flipped her skirt up onto her back, exposing her gorgeous backside. Her pussy was a glistening groove, awaiting the thrust of my cock.

I stepped in behind her, but something tugged at my attention as I did. I looked to the side, out over the lake, to the stone bridge. There were two people at the middle of the bridge. A man and a woman, standing there. Watching us.

An unholy ripple of excitement went through me. They saw us. Why I found that so hot I didn’t pause to wonder about. I wanted them to enjoy the show.

I slid my cock into Nikki from behind. She moaned appreciately as I reamed out her well-licked hole. I sank myself all the way in, touching her deep.

I gripped her hips and proceeded to fuck her like an animal. We didn’t spend any further time on preliminaries. I started out at a good speed. Our fleshy impacts echoed faintly across the water of the lake.

She rocked back against me as I stroked into her. I felt the warm clenching of her pussy. She was gripping the bark of the tree like a shipwreck survivor clinging to some flotsam. Her head whipped from side to side as I began to seriously pound her now.

In the middle of it, I looked again to the bridge. The couple remained there. They were plainly watching us. Even at this distance I thought the man wore a shocked expression. The woman was grinning, like what they were seeing was just some urban phenomenon: city tree fuckers on display!

Those strangers’ gazes heightened my pleasure. I fucked my girlfriend at mad speed. My cock blazed in and out of her pussy. When I felt her quiver and shudder, her come set off my own. I jetted spurt after spurt of liquid rapture.

Quickly I pulled out and yanked up my jeans. Nikki flipped down her skirt, and hand-in-hand we fled laughing through the trees.