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The sun was shining brightly in a clear sky, and birds chirped in the summer warmth while the kangaroo, completely immersed in the book he was reading, absently scratched his shoulder, yawned, and flipped the page.

Liam was completely nude and lay on his stomach on the recliner. He'd had plans for today, but his backyard had just looked too enticing for him to do anything else but strip down, drag the recliner off the shaded back patio and onto the grass, and relax with a good book while he sunned his fur. Plans be damned, he was going to enjoy his day off. He'd brought a glass of refreshing lavender lemonade outside with him, he was in the privacy of his own yard, his small fountain was trickling soothingly, he had a good story to read--what more could he ask for?

It was the picture of relaxation, complete with thick recliner straps that sagged comfortably under him, and gaps between the nylon supports wide enough for his cock and balls to hang freely down from his groin--that was just an added bonus in Liam's book.

Of course, it helped that the recliner was so low to the ground and he hadn't mowed the yard for so long that his cockhead brushed against the high grass tips--the light tickling on his sensitive skin simply helped him relax in the recliner even further. The hot sun would have made him sweat, but the breeze that gently blew over him and aired out his nooks and crannies (not to mention the fact that it made the grass brush more forcefully against his cockhead, which stimulated him until he was fully erect, so his stiff cock bobbed downward from between the recliner straps) was the perfect form of natural air conditioning. All in all, the kangaroo was completely content, blissfully at ease in his solitude.

Except there was something else in the backyard with him. where there was more sun, and he could feel the straps under him loosen in the summer heat.

A yellow garden slug in search of food had noticed an enticing aroma on the breeze. Intrigued, it followed the smell, slowly slithering its way through the unkempt grass that was tall enough to shade it from the sun. The slug changed course with the breeze that carried the moist, musky scent with it, correcting its trajectory, then kept onward, its body subtly undulating forward while it left behind a trail of mucus. Eventually, as Liam turned another page in his book, the slug arrived under the recliner and honed in on the scent emanating from Liam's crotch.

It wasn't instinctive hunger that drove the slug ever closer to the kangaroo's cockhead. No, as the slug slimily slithered until it was mere inches away from Liam's glans, it could tell that it had found a safe place, somewhere to shelter and hide from predators, and to produce a brood. The slug reached up with its feelers to get a closer look at the inviting, fleshy mound that hung down over it, where it saw a slit, an entrance large enough for it to squeeze into.

The slug reared up, glistening as it secreted more mucus.

At first, Liam wasn't concerned by the tickling sensation around his cockhead; he was so entranced by his novel that he simply dismissed it as the grass--his dick had been hard and poking down into it for a while that he was mostly used to it.

Then something warm and moist was slowly writhing against his glans, pressing insistently on it. Liam paused and looked up from his book, puzzled by the feeling.

"What the..."

Liam's eyes widened when he felt wet tendrils and a thicker column start spreading his urethra apart.

His stomach tensed when the slug began oozing past his urethral opening and pushing itself in.

"Oh fuck!" he yelped when he felt the sting of his upper urethral sphincter forcefully stretching around the insistent intruder.

Panicking, Liam immediately flung his book away and flipped over on the recliner, popping his stiff cock--slug and all--back through the tight straps.

"Oh my god," he groaned; viscous, slimy mucus coated his cockhead and a third of the slug had already wriggled into his cock, lubed by its slippery and sticky secretions.

Liam grunted--the small bumps in the slug's mantle rubbed slickly against the smooth inner lining of his urethra, almost tickling him from the inside. The mollusk rippled its foot, expanding and contracting as it pushed deeper into him, and the kangaroo's glans swelled and the veins on his cock bulged from the wide-bodied intruder spreading his urethra open. The slug's yellow tail slowly rolled back and forth from the effort of worming itself further into the safe, tight, warm, moist confines of his cock.

Liam tentatively tried to pinch the slug by the remaining two thirds of its body sticking out of his urethra, but the mucus was so slick that it slipped out from between his fingers, and Liam's pinching ended up helping another third of the little creature slide deeper into him.

"Aaaah shit!" he hissed as the larger ridges on the slug's body began sinking past his widened urethral lips. Liam's cock bulged around the warm, writhing invader--the slug's movements actually made his cock wag from side to side. It was slightly unnerving to watch, seeing his cock wag in his lap without any control. He tried clenching hard to impede the slug's progress, but it was no use; sphincter after sphincter was pushed open as the slug crept deeper down his shaft, widening him as it went. Liam looked down to see the enormous lump sliding down his urethra and into his pelvis, where he felt it follow the natural bend of his tubing in his taint and begin sliding up into his groin. At last, his upper urethral opening began to shrink back down, but only because the narrower tip of the slug's tail was easily sliding past it now--in a moment, the yellow tail tip disappeared and Liam's urethra closed again, with only a sticky residue of mucus left behind from the slug's passing.

"Guh-fuck!"

Liam shuddered and whimpered as the slug--now fully in his groin--penetrated his prostate with no regard for the muscle contracting around it. The mollusk simply pushed into the gland, secreting more mucus to help it along its path to its final destination. Liam bit his lip and his legs quivered from the sensations wracking his body--the slug pushing against his prostate made it feel like he was cumming in reverse, and his cock throbbed.

The girthy slug, meanwhile, widened Liam's prostate to its limit; the mollusk's bumps and ridges slid past the delicate, narrow inner walls until it finally began to exit the tight, ping-pong ball-sized organ, letting the prostate shrink back down around its tail. Liam clenched his fist and groaned when he felt the slug at last work its way into his bladder--compared to his prostate, the bladder was much easier to penetrate, and the slug easily plopped past the last sphincter and rested heavily in the warm fluids.

"Fuuuuck...guess that's the last time I read outside without underwear," Liam breathed, gripping his cock. Consciously, he knew that he'd just been forcibly infested and that he should probably seek out medical attention or at least search the internet for how to get rid of his body's new tenant...but the slug's passage had made him so unbelievably hard, he was beginning to reconcile the surprise and slight pain of the mollusk's invasion with the pleasure that it brought him...and the mucus on his glans was still warm and slick, just right to serve as lube...and he couldn't help but wonder if the slug would deposit a batch of eggs for him to piss out...which just made him throb even harder in his hand...

"Then again...could be fun to see about getting a colony in there," he muttered, stroking himself as he felt the slug slither around in his bladder.