“Are you sure about this?” Rumble asked. 

“Trust me, you’re gonna love it,” Brook responded. 

The two of them were at the store. The monkey was leading the way while pushing a shopping cart down the aisle. Rumble continued to follow but he was already feeling embarrassed. The idea sounded appealing when Brook explained it but now when it was time to act it out he was feeling nervous. 

The monkey had asked him about it the night before. He was curious about what he saw on a shelf. A large box of litter and an even bigger litter box meant for not a small pet but a full adult anthro. Rumble blushed but admitted that they were used. There was a market for it, mainly among felines like himself as one could guess. With how well it worked for their feral counterparts, a lot of anthro felines took to using a litter box themselves. Rumble admitted that it could be useful in times when the toilet was broken or even when going somewhere where a proper toilet wasn’t available. The cougar recalled having one meant for the family in his parent’s house. It wasn’t used often and Rumble hadn’t put too much thought into it. 

But Brook was very interested and convinced Rumble to come with him. They went down the aisle and found the things they were looking for. He let the cougar pick out which one he wanted. Rumble blushed hard as he picked out a large blue litter box while Brook got the litter and other things they would need. The monkey was snickering when they returned to the front and got the things rung up and the employee flashed Rumble a look. 

With all the things bought, there was another matter at hand. Rumble was also asked to refrain from using the bathroom. As they were returning home it was starting to catch up with the cougar. The two of them walked back home and that meant the journey would take longer than what a car ride would provide. The whole way, Brook was teasing him by suggesting how good it would feel when it was all set up. Rumble tried his best to ignore these words but he couldn’t ignore the throbbing of his bladder, it being full and heavy at this point. He picked up the pace, being nearly home and ran the risk of losing control. Panting hard and putting his focus into holding it, he ushered himself and the box down the neighborhood. Brook kept up with him but was amused the whole time, snickering and laughing as he watched the feline strain to keep a hold of himself. 

Thankfully they returned to Rumble’s apartment and when getting inside the two were making a beeline for the bathroom. Rumble sat on the toilet’s lid, fidgeting as Brook placed the large litter box against the wall. He filled the box with litter up to the right point and finally stepped aside so it could be used. 

Brook watched as Rumble quickly got himself ready to use the box properly. He took off his shorts and underwear, followed by his shoes and socks. Panting and still trembling, Rumble climbed inside and got down low by squatting. Using it while standing would cause splashing so it was best to get down as close to the litter as possible. He knew that Brook was watching but his focus was on relieving himself. 

It had been such a long time since doing this that Rumble had nearly forgotten how good it felt. As he let go and finally began to piss into the litter, a deep sigh could be heard from him. An expression of bliss overtook his face and he shivered as a thick stream of hot water raced out of him. Along with the pleasure of draining his bladder, the cougar felt an innate satisfaction from wetting the litter. He felt the warmth spreading out, radiating from the litter that absorbed his liquid waste. This box was meant for him and in a way he was marking it. As the urgency died away, Rumble began to enjoy the steady flow of his urine, listening to the stream starting to die down. 

The whole time, Brook had been watching the other male go. He was turned on in no time and was soon stroking his cock to the sight of the feline wetting the litter underneath him. When Rumble finished he quickly grew hard as well. Up to this point he thought of using the litter box as something embarrassing but it was rather exciting. His piss was absorbed but he felt the comfortable heat against his rump and under his feet. 

He joined in and stroked his cock as well. Brook came in close and leaned down to the cougar’s level. His strokes grew faster as he pointed his tip at the freshly marked litter. “Did it feel good?” he asked. 

“Mmm, it felt amazing…” Rumble admitted, already panting as his hand sailed up and down his own shaft. 

“It was hot watching you piss,” the monkey said. “I think you should keep using it.” Rumble nodded and felt himself getting close just from the thought. With a sudden growl he unleashed a few spurts of his cum that struck the litter, painting the grains with ropes of his sticky release. Brook soon followed suit, groaning as he came as well, adding his own seed to the mess. 

Rumble did continue to use the litter box and Brook would be there to watch sometimes. There was just something about doing it in front of the monkey that added a thrill and there was also the feeling of the litter heating up from his urine. When done he would sometimes jerk off with the monkey and cover the wet litter. 

The next time he had to go, Rumble undressed and began to squat but he held it in and gave Brook a smirk. “You know this box is pretty big. I think there’s enough room for the both of us.” 

“Oh, is there?” Brook asked. 

Rumble nodded and padded the litter beside him as if it was an open chair. Brook took his clothes off as well and climbed in the box, chuckling a bit as he felt the smooth grains under his feet. He copied the feline and squatted down, reaching in between his legs to make sure his cock was aiming right. 

“I think it’s about time we changed out the litter,” Brook noted, feeling that it was still a bit wet from Rumble using it that morning. “And it smells like you in here.” When standing in the box he noticed the scent of the cougar’s marking rising up from the absorbent grains. Now it was his turn to feel some excitement and even a bit of sheepishness at the idea of going like this. 

Rumble was already going ahead. He groaned as he let loose a thick stream of his urine. His ears flicked from the sound of the fluid splattering down. Wearing a pleased expression on his face, he looked over to see Brook take a deep breath before closing his eyes. 

Brook got himself to relax and sighed as he finally released the contents of his bladder. With the two of them relieving themselves at the same time, the litter was getting warm rather quickly. Now it was Brook’s turn to feel the simple yet exciting sensation of the heat spreading under his feet as the grains thickened and clumped while absorbing his slightly yellow release. The monkey let the pleasure ease away the last of his nerves and his stream grew stronger. 

The both of them enjoyed the feeling of their urine spilling out. It was thrilling but also provided a sense of comradery from doing this together. Letting loose the last of their urine at the same time was rather intimate and Rumble was already in the mood to take things a bit further. He was about to open his mouth but was struck with another familiar feeling that made him blush a bit. 

“Uh, Brook. I got something else I gotta do. Like, that other thing…” Rumble admitted. The toilet was usually still used for that but he could feel that it was ready to come out and he was already squatting. 

“Just let it out, big guy. We’re already in the perfect place,” Brook said. 

Rumble felt a bit better but was still embarrassed about what he was about to do. For this he needed to dig out a spot, using his hand to move some litter aside. He formed a pit that would be covered again when finished. With all of that taken care of, Rumble squatted down a bit lower over the dugout. 

The cougar blushed and grunted as his tailhole began to slowly expand from the load that was exiting. He heard some shifting and looked over to see Brook leaning back so he could watch. With another grunt Rumble began to slowly push the soft brown log out. The feline let out a soft moan as more of it slid out of him. Given the cougar’s high protein diet, his hole was spread wider than Brook expected. He watched the soft yet solid waste slide out even more as another push came. From there it was sliding out without issue, reaching down into the sandy pit. Some of it broke off and fell in but there was more that was excreted, leading to some thick chunks that lined the bottom of the dugout. Rumble huffed through clenched teeth, ejecting the last of it out of his bowels. There was a soft thud that was heard as the thick log of waste fell into the ditch. Rumble finally sighed and his tail flicked from the satisfaction that came after dropping a load like that. When the feeling passed he covered up his mess with the litter he scooped out beforehand, keeping the smell from reaching the both of them. 

Brook had watched the whole thing and he was rock hard. He realized that now the two of them were squatting over their own waste and that turned him on heavily. Taking the other male by surprise, he gently shoved Rumble and got the cougar on his back. Feeling the warm litter crunching against his back, the cougar looked up at the eager monkey. 

“Don’t worry, I got you, big guy…” Brook eased down the bigger male’s body until he was underneath the tail. Without hesitation he pressed his tongue to the rim and moaned as he cleaned away the traces of waste that had yet to be wiped away. It was cleaned away with his licks and Rumble was shocked by this. But when the tongue was shoved inside, the pleasure overtook him and he was unable to do anything more than moan. 

Brook swirled his tongue along the walls, cleaning away the remaining traces. The hole was a bit loose from the dump that was just taken and he added his own saliva to that. After that he pulled his tongue free and eased his head in between Rumble’s legs. Keeping up the pleasure, the primate took Rumble’s cock into his mouth. His lips wrapped around the leaky cocktip and was smoothly sinking down to take the rest. 


Rumble moaned within the bathroom as his cock was smoothly sucked on. Brook bobbed his head up and down while playing with the cougar’s balls. He could feel the shaft throbbing in his mouth and the taste of precum was getting stronger on his tongue. The monkey’s tongue added furthered pleasure and he began to purr as his mind was becoming hazed with pleasure. He was taking deep breaths and throwing his head back upon reaching his limit. He snarled and came hard inside of the monkey’s mouth, giving him a full load to drink down. Brook moaned against the warmth and taste, pulling his mouth free as the final spurt streaked his cheek. 

The monkey collected it and smeared it on his own cock while positioning himself to penetrate the cougar. Without warning, he shoved his cock inside, sinking it all the way down to the hilt. Rumble was back to moaning out as the length pulled back, humping humped deep inside again. His tailhole was stretched further and Brook used that as he began humping roughly into the feline’s ass. The both of them moaned together and the monkey shuddered as the tight hole squeezed down even harder. Pumping with more speed, Brook groaned deeply as he came inside, painting the feline’s ass with his spunk. 

“I knew you’d love the litter box…” Brook said, beaming with pride and satisfaction while Rumble just panted and nodded.