The forests of Kalos were quiet, peaceful and serene, as the two Pokemon assassins travelled between verdant trees. They were deep in the woods, far off from any known paths to avoid detection. They were already deep in Montigue lands, who'd been feuding with their Capulet masters off and on for years. If the lord, his soldiers or subjects found them before they completed their mission, their deaths would be slow, cruel and agonizing. Fortunately, Lucario and Greninja were trained as rangers as well as rogues - in another place and time, they would've made excellent ninjas.
Lucario held his paw up, and Greninja stopped. The jackal sniffed, glancing up at the sky and at the long shadows around them. "It's getting late," Lucario decreed solemnly, "These woods are perilous at night. Let's make camp for the night, Gren."
"Alright, Luc." Greninja agreed, "There's a hollowed-out tree over there. We can take shelter inside."
As they went about preparing their beds and their meals, Gren looked back at the long relationship he had with his mentor, friend and partner Luc. They had met many years ago, when Lucario was a freshly evolved and graduated assassin, and he was a poor, abandoned Froakie starving on the side of the road. Luc had taken pity on him, and had merely intended to escort him to the nearest town or monastery. After the young Pokemon helped him fight off some foolish bandits, Luc was impressed enough to take him on as an apprentice. Over the years, Froakie learned much, and by the time he became a Frogadier, he became fairly adept at the art of combat and espionage.
As he grew older, the relationship between them changed. As a Froakie, he was a cute apprentice and sidekick. As a Frogadier, however, Lucario opened him up to a new level of education, as he taught him what it meant to be male - in all senses of the word. When Luc approached him intimately, Gren gave his heart and body willingly. There were some tales of masters exploiting their apprentices, ravaging them merely for their own enjoyment. Luc wasn't like that. Their relationship was much more mutual and respectful: He taught him the value of respecting boundaries and going slow, and though Luc made some moves on Gren, the frog had a crush on his mentor too, and made some moves of his own as he developed his skills and confidence.
When he finally evolved into a Greninja, they separated for a time, allowing Gren to prove himself as an assassin, and to find himself as his own person out of Luc's shadow. It'd been a few years since he last worked with his mentor, and since then he felt that he'd come into his own. There had been plenty of missions he completed, plenty of bad guys he took out, plenty of guys and gals (human and Pokemon) he'd taken to bed. He grew up into the 'Mon Luc had always told him he could be.
And despite the passage of time, his mentor was still at the top of his game. Sure, there were a few gray and white hairs sprinkled across his blue-black muzzle, and maybe there were hints of crow's feet around his wizened red eyes. But when Gren and Luc sparred last before they started their journey, the old jackal was just as fast and strong as he remembered. When Lord Capulet offered them this job with his old master, he leaped at the chance to work with his old master once again.
And so here they were, two days into their journey, alone and deep in the woods, enjoying dinner and a fire under a moonlit starry sky. Just like old times.
They dug into their rations in silence, taking in the beauty of nature while scanning their surroundings for potential scouts or raiding parties. They would glance at each other now and then, the quiet helping to build an anticipation for something they hadn't felt in a long time.
"Hey," Gren prompted, "You up for some quick fun? It's been our tradition."
Luc smiled, and nodded. "Hope you don't mind topping," He said, putting his mess kit aside, "There are still patrols to worry about, and we can't afford to be stuck together for thirty minutes while making our escape."
"You could've just said you wanted ride this Greninja cock," Gren teased, doing the same and putting out the fire.
"That goes without saying," Luc chuckled, crawling over to the hollowed-out tree. Gren smiled and followed him, entering the inside of a tree easily big enough for a Ryhorn to rest comfortably in. The hollow was dark, only illuminated by the moonlight pouring in from a hole high above them. He spotted the red eyes of his former master and lover, crawling up to him while mindful of his still-sharp chest spike. They kissed - a deep, hungry joining of mouths that skipped past all the foreplay for the immediate satisfaction of need.
Off-mission, the two might've taken their time, warmed themselves up, make use of their differences and the long night ahead of them. This time, not so much. This time, they both knew what they wanted, and how to get it. Gren's webbed paw rubbed and caressed his mentor's sheath, even as Luc's paw went to stroke and probe his student's slit, in a move they've done dozens of times. The younger Mon's tongue filled the older one's mouth, curling around his tongue and milking it like a cock.
"Mmmph! Fuck, Gren," Luc grunted, when they broke the kiss to breathe again, "You've gotten good at that."
"I've had plenty of practice," Gren agreed, licking his furry chest, "And an excellent teacher."
"I bet," He agreed, his pawpads wrapping around Gren's tapering penis and giving it a rub and tug. Gren returned the favor, pulling his sheath and squeezing the thick red sausage that proudly emerged.
"Arceus, I've missed this, master," Gren sighed, licking along the underside of his jackal dick, "You don't mind if I still call you 'master' when we do this, do you?"
"No, not at all," Luc grunted, biting his lip, "I always liked it when you called me that. Especially when you would moan it, taking my knot better than most bitches even as a youth."
Gren had to fight back the urge to squee. Even as an accomplished adult, the merest compliment from her teacher and father figure was enough to make cheeks blush, hearts race, and manhood swell with pride. For so much of his life, his greatest goal was impressing Luc, proving that he could be just as deadly and awesome and handsome as him. That he now saw the amphibian as worthy enough to fill his rump made Gren harder than spending the week in a spa with a dozen Gardevoirs and Machokes.
"Huh, well look at that?" Luc observed, snapping Gren out of his thoughts, "You beat me by a tenth of an inch. Still got you beat in width, though."
Gren looked down. Their dicks were almost touching, standing at full attention now. The Lucario was right - Gren's was the tiniest bit taller, even as Luc's knot nearly doubled the thickness of his. The older 'Mon started to prop himself up against Gren and climb on, but the younger 'Mon stopped him.
"Hold on," Gren cautioned, "There's something I need to do first." He rolled away from the Lucario, pressing his back against the wood and taking an almost squatting position. He swirled his hand in the air, collecting the moisture into a cylindrical tube shape. A couple more spins, and it was now in the shape of Lucario's manhood. Approving of the final product, he placed it on the ground, pointing up. Gren spread his buttcheeks apart, slowly lowering himself upon it. Water isn't exactly a great lubricant, but it still went in a lot easier than most males going in dry. With a grunt and a wince, the aquatic construct slipped in, and he slipped almost down to the knot.
"That's a neat trick," Luc complimented.
"Y-Yeah," Gren said, "Something I picked up along the way. I based it off yours. It's the first dick I've ever taken, and the best."
"Well, now you get to return the favor," Luc replied, positioning himself above him. Spreading his own cheeks, he lowered himself onto Gren's member, pressing down until he felt the tip slip in. He sighed as he slid further and further down, until his balls touched Gren's crotch, his own manhood twitching eagerly in Gren's face. Gren extended his tongue, coiling around Luc's dick, getting it nice and snug and tight. The old 'Mon bit his lip, holding back a moan of pleasure, as he started lifting himself up and down on his student's dick. Gren moved in kind, riding his water dildo while working his partner's cock with his thick, stretchy tongue. The pair rocked and moved together, grunting and moaning as they gave and received pleasure from both ends. It was hard to tell who was getting the better end of the deal, but it was a close affair regardless. The stump was filled with the sounds of Luc's lustful grunts, and Gren slurping on his nob.
"Fuck, Gren," He muttered, "You've gotten better at this. Not many, ah, 'Mons or Men can pull off a suck n' fuck like this." Gren squeezed his ass approvingly. Luc leaned in, pulling his lover's head against his shoulder, adjusting his angle and increasing the speed of his ride. His protégé hummed approvingly (the vibrations carrying through his tongue), and matched his thrusts accordingly.
"Yeah," Luc said in between grunts and groans, "That's it. Suck me dry, boy. Fill my ass with your spunk. Squeeze my knot, just like I showed you."
Gren knew that when his master broke out the dirty talk, he was getting close. As such, he had one more trick up his sleeve, something he was almost certain Luc had never experienced before. His tongue slithered and slid around, caressing his furry balls. Holding his dick in position with a coil of tongue, Gren leaned forward, taking his thick red cock into his wide mouth. As he bobbed his head back and forth, his tongue continued to extend, coiling around his own member and penetrating Lucario's rear.
Luc moaned his groaning pleasure, unable to handle all the sensations buffeting him from all sides. Gren was working him every way he enjoyed. He wasn't going to last very long at all, and truthfully he didn't want to hold back. Feeling the tension building to an explosive climax, he bit down on Gren's leather shoulderpad. As teeth dug into leather, he pushed down on Gren's dick, pulled his head down on his own member, and came. Taking his master's knot in his mouth, Gren felt hot, thick semen spray the back of his throat, pouring down into his gut. His anus clenched with each squirt, and it was more than enough to push him over the edge as well. He thrusted himself as deep as he could into his master's ass, and released his equally potent seed deep inside his belly.
They sat there, intertwined, riding out their respective orgasms, creating a cycle of filling and emptying themselves into each other. Gren marveled at being able to taste himself and his master's seed at the same time, savoring the different tastes. In time, they came down from their respective highs, as Luc released his bite. Gren pulled his tongue back, collecting all of their fluids so as to keep themselves and their campsite clean. Within two minutes, they'd cleaned themselves up, had snuffed out the campfire, and were laying together in the stump, safe and comfortable.
"Boy, you got some skills," Luc chuckled, lying on his back with his chest spike pointing up. Gren was at his side, an arm stretched out across his stomach. He smiled again at the compliment, nuzzling his neck affectionately.
"After we finish this mission," Gren asked, "You wanna rent out a room and return the favor? I'd love to get filled with your knot for real next time."
"I think that can be arranged." He gave him another quick kiss, and together they fell into a pleasant slumber, ready to take on as many guards and warlords as they had to, to enjoy the fruits of their labor...