The doorbell rang throughout the cougar's apartment, and he hurried to answer the door. His visitor was a black wolf a little more than a head taller than him, dressed in shorts and a T-shirt the same color as his coat with a flaming skull printed in the center, in his hands the canine carried a rather full folder. The feline, who was dressed only in shorts, smiled and let his college roommate pass.

After taking a few steps into the apartment, and dropping his heavy folder on a table, the lupine said, "You have a very nice place, and it smells good."

"Thanks, Duncan, a friend of my mother's helped us get it at a good price," the cougar explained.

"Oh right! Your last name was...Walsh!" the lupine replied, as if he had noticed an important detail.

"Yes...No need to ask, the answer is yes, I'm from that family, but please don't say it in class," admitted the feline, a bit annoyed.

"Easy brother, I won't say a word, I don't like to go around spreading gossip," the canine clarified.

"Thanks, Duncan, for a second there I thought I was going to have to bribe you with the twenty dollars I have left on my desk," snorted the homeowner.

"Not your twenty dollars, but I wouldn't mind checking your fridge," the wolf scoffed.

"Well...what's on today?" asked the feline, taking a seat at the table and opening his own folder.

"Today is unit 3, comparative social anatomy," replied the lupine, sitting down across from his friend.

After two hours of intensive reading and a few bathroom breaks, the duo was exhausted, the exchange of useful ideas had gradually faded to trivial chatter on the topics they had been reading.

"I still find that flaring thing equines have pretty crazy," laughed the cougar.

"It doesn't seem so strange to me, it's like having a knot at the tip instead of at the base of the dick," the lupine thought aloud.

"That knot thing seems super weird to me too," the feline added.

"What's really crazy is having spikes on the sausage, I don't understand how they can bear it," said Duncan.

"They're not that terrible or that big, you can hardly feel them. I guess that for females it must be like a massage or a tickle..." replied the cougar.

"I thought it was a super rough texture, like they say their tongues are," the black wolf continued.

"They are perceptible to the touch and they swell a bit when we ejaculate but it's not like they are blades or needles," the feline explained.

"Can I touch them?" asked the canine, pointedly.

"What, touch what thing?" asked the cougar, not understanding what his friend was saying.

"Your cock," clarified the lupine, shrugging.

"M-My dick?" stammered the homeowner.

"Sure, so I can get a working example of what it looks like and what texture it has. I'll let you do the same with mine," the wolf explained.

"I...I don't know, I've never seen another male's cock...it seems very strange to me," the feline exposed his doubt.

"Don't worry, it's quite normal. With my roommates we even used to masturbate together some nights after a few beers," confessed the canine.

"I guess we could do that then..." sighed the cougar, still not entirely convinced.

"Besides, we have to prove or disprove about what the book says about the size of felines," said the wolf, excitedly picking up one of the books they had been reading to point his index finger at one of the paragraphs.

"I don't think the book is wrong, mine is very small compared to a horse's..." replied the feline, rather embarrassed.

"Pff! But what are you saying? We all have small dicks compared to a horse," laughed the canine upon hearing his friend's defense.

"Well...Maybe you canines have huge dicks..." added the cougar.

Duncan got up from his chair and gave the feline a couple of friendly pats on the shoulder, and said, "Max, nobody cares what size your dick is, this isn't a competition, bro."

"Yeah...I-I'm sorry, it's just..." stammered the feline.

"Only child, right?" asked the wolf.

"Yes..." replied Max.

"There were six of us in my household: my mother, four sisters and me," listed the canine.

"I don't get it...what's the difference?" asked the cougar, rising from his chair as well.

The two friends walked chatting to the kitchen, where the feline opened the refrigerator and pulled out a couple of cold bottles of beer, offered one to the wolf, and together they began to drink them as they walked back to the lobby.

"What happens is that we males, usually, think too much with our balls, we think our penis is the big thing and everything revolves around that. Females understand that the dick is just another part of our body, just like the nose or the ears. For example, you have a very small nose, but that doesn't define you," Duncan explained and pointed out.

"What, my nose is normal, I don't know any felines that have big noses," Max argued.

"That's too bad, there's nothing better than a big nose to sniff out your mate," the wolf admitted.

"Okay...now that's weird," said the cougar, touching his friend's nose with his index finger.

"Shuu! Leave me alone, it's a canine thing, you wouldn't understand," Duncan replied, laughing as he tried to cover his nose from the feline's attack.

"Yeah right...a canine thing," Max scoffed.

The wolf growled, set his beer down on the couch, and removed his t-shirt, revealing a rather overworked torso, with an abdomen adorned by six striking muscles on which the feline immediately set his sights.

"Hey...do you have a ruler or a measuring square?" the canine asked.

"Yes! Just a second," the cougar hastened to reply, as he awoke from the hypnotic figure of his companion.

As Max rummaged through a nearby desk drawer, Duncan finished undressing, removing his sneakers, socks, and pants, it was laundry day and the wolf had decided to go commando while all his underwear was in the washer. Turning around, with a wooden ruler in his hand, the feline let out a groan at the sight of his friend's completely naked body, black fur spread over all the areas previously covered by clothing, and a particularly bushy bush of pubic hair announcing at the bottom of his abdomen the beginning of his crotch, a thick, hairy sheath from which a pair of testicles fell at different heights.

"Too much wolf for you?" teased Duncan, winking as he grabbed his balls with one hand.

"I-I thought we'd take it slow..." stammered the feline, trying to avert his gaze elsewhere.

"I bet you've never seen balls as big as mine," exclaimed the canine.

"I've never seen another pair of balls besides mine..." admitted Max.

"Never? Not even in a porno movie?" asked the lupine, with real curiosity.

"No...You know they don't usually focus on the male parts in those movies," the cougar reminded.

"What kind of boring porn do you watch?" asked Duncan again, this time swinging his testicles like a little bell.

"The usual...what they show on TV," Max replied to the question how obvious it seemed to him.

"Now I understand why fate crossed us. Brother, the porn is watched on the internet!" shouted Duncan.

"I wasn't allowed to have internet access at home!" moaned the cougar, defending himself.

"You're a hopeless case. Finish that beer and let's get educated together," said the black wolf, and in one gulp emptied his bottle and then let out a loud belch.

"Fine, but let's go to my room, the couch is too uncomfortable for the two of us to sit on," Max offered.

The two males went to the bedroom and, seeing the fluffy bed, the wolf jumped on it, but the cougar pulled him by the leg until he fell to the floor, where there was a colorful carpet on which the feline also sat down.

"But the bed..." groaned Duncan.

"That's where I sleep, I'm not going to let you rest your balls on my bed," exclaimed the feline.

"I'm sure that comment has some degree of specism..." protested the canine.

"Of course it does, my bed is for cats only, not canines," Max sentenced.

Duncan turned his head slightly and sniffed the sheets of his friend's bed a couple of times. "You bet it's only for felines...with the smell of dried semen on the fabric this place is like one big feline graveyard," the wolf said, grimacing in disgust.

"It's no big deal either, it's not like I masturbate very often..." replied the cougar.

"Says you with your little nose, you inexperienced little nose," sneered the canine.

"Can you put aside your nose skills and focus on dicks?" growled the feline, pointing at the wolf's sheath with his wooden ruler.

"Well...let's make the most of this experience: I'll touch your crotch and you'll touch mine, so we'll feel each other's texture," explained Duncan.

"What? I'm not going to touch your dick!" exclaimed Max.

The wolf raised an eyebrow and, after a few seconds, leaned over to his friend and cupped the cougar's crotch with one hand, caressing his hairy testicles and gently slipping one of his fingers into the hole of the feline sheath.

"Oh...Oh! Hmm..." moaned the feline as he felt the canine's fingers touching his private parts.

After hesitating for a moment, Max also reached out his trembling hand and grabbed the wolf's fat sheath, it was furry, stiff and fit his whole hand. Sticking his index finger in, the cougar immediately encountered a wet tip that was soon wetting all over the fur on his finger as he moved it around the growing penis that was slowly emerging from its sheath.

"It's not coming out...hmm, let's see if I play around here..." muttered the wolf, pulling his finger out of his friend's sheath, discreetly lowering his hand down to his balls to fondle them for a moment, and subsequently lowering his fingers even further to plunge one of them into the feline's anus.

"MEOW!" reacted Max, jumping up and standing up as he felt something touching his rear entrance.

"Ooh, look! It worked," Duncan pointed out, as he saw the cougar's pointed penis completely out.

"Could you warn me before you do that?" asked Max, with an angry tone.

"It's not my fault your dick works like a Swiss Army knife," scoffed the wolf.

"Well, this is what I think of your dripping cock," replied the feline, whipping his wet index finger just inches from his friend's face, sending droplets of precum flying into the canine's muzzle.

"Ahgg! Dude, that's disgusting!" complained Duncan.

"Better in your fur than on my carpet," said Max, sketching a smile of victory.

"Fine...sit back down and let's move on," offered the lupine, patting a couple of times where the feline had been sitting just seconds ago.

The cougar nodded and resumed his place, crossing his legs and leaning back slightly, revealing his erection with some pride.

"Yours isn't out yet either. Need me to stick my fist up your ass?" the cougar teased, showing off his fist.

"Ha ha! Looks like someone took too much pleasure in having his ass touched," countered the canine, grinning.

"N-No! I was just saying that because we can barely see the tip of your dick!" rushed Max in reply.

"Oh! Don't worry about that, it's kind of lazy and likes to stay covered. I just have to do this and I'm done," explained Duncan, grabbing his sheath and pulling it back to bring out his red rocket, leaving only his trademark canine knot still sheltered.

"Holy shit! Look how that thing squirts..." the cougar was surprised, watching as that reddish piece of canine flesh spat out a translucent liquid every few seconds.

"Touch it, it's smooth and has free lube," offered the wolf.

"Fine...but I'll dry on you," Max threatened, before reaching out and gently grasping his friend's penis, moving it up and down.

"It's no big deal, think of it as fur gel. Yours looks like a stretched strawberry, it looks prettier than in the books" the canine teased, stretching out his hand and doing the same thing the cougar was doing with his penis, feeling the little spikes around the deep pink member.

" It's really soft, it feels good to the touch...I'm going to measure it," the feline said, withdrawing his hand and bringing the wooden ruler closer, settling it against the increasingly swollen knot and following the markings.

Both males watched the measurement closely, then the wolf withdrew his hand from Max's member, allowing the cougar to perform the measurement on his own penis, again capturing the attention of both friends.

"Oh! Wait," Duncan said, and stretched his sheath a little more until he brought out the huge ball of flesh that had slowly swollen at the base of his cock, "the knot adds a few inches to it," the wolf clarified.

"Shall I measure it again?" asked Max, feeling somewhat overwhelmed by the size.

"No, that's not necessary. I just wanted to show it to you because it's part of my dick too," confessed the canine.

"It looks ridiculously big, how do you guys get that inside any hole?" the feline continued hesitantly.

"Well...there are many ways, but mainly two: if you're good in the head, you put the knot in when it's still small and make gentle movements while it gets bigger until it stuck; if you're a brute and like it hardcore, you keep fucking it like nothing's wrong and when it's full size you push it in by force," Duncan detailed.

"Fuck...it must hurt..." muttered the cougar, fixing his eyes on his friend's knot.

"It drives some people crazy, but it's really not something for beginners," said the wolf.

"I can imagine...sticking an apple up your ass must drive anyone crazy..." commented Max, thinking out loud.

"In the ass?" asked the canine, raising an eyebrow and smiling.

"I-I mean...in an ass or anywhere..." rushed the feline to clarify what he had been thinking.

"I don't know...sounds like you want to try what it feels like to have a wolf knot in your ass," the lupine teased, taking his penis from the base and wiggling it.

"Of course not! Maybe you're the one who wants to taste what it feels like to have feline meat in your ass!" defended Max, with all his back fur bristling.

"Sure, I don't think it's that bad," admitted Duncan, shrugging.

"R-Really?" asked the feline, not hiding his excitement.

"Yeah, I have not done it before, but I trust you and I'm sure we could have a good time," the wolf explained.

"Okay! So what do I do now?" the cougar continued, getting up from the rug.

"Easy...You could start by getting us a couple more beers," advised the canine.

"Marching some beers!" replied Max before scurrying out of his room.

Duncan watched his friend march as he stood chuckling and thinking about what was about to happen.