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"So it'd be infinity, right?"

I groaned, "Technically it would approach infinity from the positive, but from the negative it'd approach negative infinity. It would reach neither as it attempts to be both at the same time... and also infinity isn't a real number."

"What?"

"You can't divide by zero," I waved my hand about, "and no one's going to expect you to know why until Calculus."

The kid looked at me a little lost.

"Get in their heads," I tried for an explanation, "They're not going to give you awkward numbers, or make you do things they haven't talked about yet. There won't be long decimals, irregular fractions, or rarely used formulae unless they're specifically testing you on them. Teachers would go nuts if their textbooks made them work that hard."

Before he had a chance to say anything I continued, "When the problem gets too hard or expects you to do math you haven't learned, you probably made some little error in working it through."

Mop was a smart kid, at least according to his mother. He just had trouble with numbers. I was still getting used to the idea that someone could be bad with numbers and still be intelligent, but that was my prejudice to get past. The Shih Tzu was still a pup, nineteen and some change, and I was running on thirty, I don't know why it was determined acceptable that we be left alone together, but that was that.

His mother was a friend of a friend... of my roommate's, and I had been suggested to her as someone who was pretty good with numbers, who could help the little guy out. He resisted the whole way, until we met and he realized I wasn't going to bite his head off. Or at first that's what I thought.

The whole situation was kind of weird, and I had half a mind to bail. His mother went out on the town minutes after I showed up, and apparently she wasn't going to be back until late. With how little progress Mop was showing, I nearly walked out, but the look of helplessness he gave me was just too much.

I pointed at his sheet, "Look here, what's six by nine?"

"Forty two?" Mop responded automatically.

"Which Earth are we on?" I tried.

Mop blinked, thought for a moment, then took eraser to page. Suddenly the numbers lined up nice and neat, and he worked a bit until his answer came out right, as far as I could tell.

Though I was quite proud of the kid for finally getting his head out from under his tail, I found myself in the midst of a mighty yawn. I didn't know how the kid could stand it, fur draping a foot long all about, but I was panting like a working dog. I knew it was winter, but they had the heater on full blast.

I caught the pup with wide eyes, not looking at his homework, or up at me... or well, down at me. The pup, the kid, the little bitty Shih Tzu, still had a couple inches on me. He was very carefully and obviously not watching my sweater come up nearly to by belly button, white belly fur showing.

"Sorry about that," I commented, pulling my sweater back down.

He nervously chuckled, "You're beu-uh, good."

"Right, so do we have this figured out?" I tried for some closure, I knew the answer would likely be no, but...

"I think it just clicked," he admitted, "You're probably right about the lazy teacher thing. I just need..." he finally noticed my panting, "are you alright?"

"It's just hot in here," I pointed out.

"You can take off your..."

I cut him off, "I'm not wearing anything underneath," then I winced.

Apparently, Mop didn't notice though. He was busy not looking at me again, very obviously doing so in fact. It was such an obvious effort, he even took pencil to page and both started and finished a math problem unprompted for the first time.

I looked it over and confirmed it was right, mindlessly putting a paw on his shoulder out of a weird sense of pride. He reacted the way dogs do. His body jerked in surprised before leaning into my touch like he wanted to mold into me. He leaned in so much my paw slipped past the back of his neck and opposite shoulder. He pressed into my chest before either of us reacted to his instincts.

I had to remind myself of self control. The heat was literal, not... well, with my irregular heat cycle, that I really don't want to get into here, I could be. Heck, this wasn't even far off of when my sisters would go into heat... so maybe I was on cycle for once in my life. Which meant...

"Self control," I whispered to myself.

Mop noticed, pulled himself up, but asked, "Sorry, that was just the way Mom does that."

Oh no, was he that type? I didn't look much like his mother. She was short and kind of chubby, sure, but I was bright red and had... okay so I noticed his mother's gigantic breasts that I don't really have, sue me. I have a bigger, plusher butt though, so it evens out.

"I just don't want someone to think I'm going after someone's pup," I stated.

"I'm not a pup!" he protested, "I'm in college!"

I couldn't help but let out a laugh at that.

Dejected, he leaned back into the couch a bit, pouty face on full display. I leaned over, tried to show I didn't mean offense, patting him on the leg. I questioned my logic, looking down and too my relief, this wasn't the porno moment where I noticed his bulge or something.

"Are you sure you're alright?" He came over his pouts fast, "You are panting pretty hard."

I was, and I had to remind him, "It's just kind of hot in here."

Mop tilted his head, "I set it to sixty-eight when Mom left."

I closed my eyes slowly and considered the ramifications of that sentence. Two statements, both important, both damning. I would have to consider my next words very carefully.

Mop figured it out first, giving me a long lick up the side of my neck. My whole body quivered, what a thing to go for first. He gauged my reaction as my suddenly active sex drive waged war on my decency.

I opened my eyes again, again to look at the very pleased pup. He obviously thought he was about to get laid. The sudden burning in my loin suggested he was probably right. But if my body was going to demand this, my mind wanted in, so I'd have to come up with some clever dialog to satisfy that.

"Are you..." I tried, honestly I did, "a virgin?"

"No," he grumped.

I gave him a twisted grin, "Prove it," and hoped he got the joke.

He didn't, but he didn't have to. The beauty of a good double entendre is that you can take either meaning, and... I guess I just verbally consented to him immediately taking my modest breasts in a paw each.

I shuddered as he kneaded my fluffy chest, my paw still on his leg grasping a bit harder. My teets were already at attention, which usually doesn't show through the thick fabric, but touch was different. He homed in, tweaking my nipples under thumb and forefinger. It wasn't until my back was arched and I was leaning foreword that I realized he had somehow dragged me towards him by my teets.

He gave me a sloppy puppy kiss on the side of my muzzle, tongue tickling my whiskers until my mouth fell open and he slipped it inside. He tasted neutral, sadly, but he explored like a dog would. Licking across my teeth, sliding up the roof of my mouth, then meeting me in a dance of tongues that proved he had, in fact, done this before.

Suddenly a paw found its way under my top. I longed to feel his pawpads directly on my nipple flesh, but he stopped short. He rubbed his little blunt claws into my belly. It tickled, or at least my leg kicked, thumping on the floor.

Mop broke from the kiss to grin, "You like that?"

I blushed and looked away, but he noticed immediately, that my stomach was still presented. He took two paws to give me a solid petting, and as weird as it seemed, the simple touch drove my body back into the couch, laying down into a bed of comfort and security. Not the normal words I associate with needing a dick in me, but gods if my kicking leg didn't feel right.

He chuckled, "You said you were hot, right?"

By the time he finished speaking my sweater had already been flung at the living room piano. Just for good measure I peeled my pants off by the waist, not even registering his surprise at getting them off so easily.

Mop stared at me for a long moment. Shock slowly turned to pride, then with a curious sniff of the air, to urgency.

"In my room I've got some con-" he began.

"I need you," I cut him off.

Funny how that line always seems to work. As he decided that he'd just strip right there. I watched as his shirt pulled up, revealing his white shaggy belly fur, slowly letting his fur fall as his chest was revealed to be just as moppy. He tossed his shirt aside and gave me a quizzical look.

"Are you touching yourself?" He laughed.

I hadn't even noticed, but my fingers were perched and ready to slide right into my heat. I gave a gentle smile, then watched as he unfastened his belt. I couldn't resist rubbing up against my clit, letting out an involuntary huff as his pants came down, the slight bulge in his boxers. I spread my knees apart and slipped my finger in to a soft moan, just to see if I could make the bulge a little bigger. It worked.

He grabbed me by the wrist and pulled my hand away. "That's my job," he said, then couldn't resist licking my juices off the offending digit.

As the boxers came off, the elastic having to stretch quite a bit to clear his erection, I struggled not to return my fingers to my wanting pussy. He was sporting a bright red rocket, knot already hinted at, in contrast to his white and cream fur.

He was atop me in an instant. Groin to groin, throbbing member sliding against sopping passage. I thought about the previous partners who had insisted on committing to oral while I was in this state, one even creaming his own pants, the musk fiend, but Mop seemed to know I was ready.

He lined himself up with a paw, his tip tickling the edge of entry. I licked my chops, trying not to go too feral, but wanting it all the same. He toyed with the concept of hotdogging for a single pass, my pussy quivering, and a growl left my throat.

Then he pressed in. Normally, I would talk about how tantalizingly slow the entry was, but apparently my heat was such that he filled me without a problem. I moaned, as my pussy tightened around him, not an orgasm, or a full one at least, but the blood rush was there and I was already panting again.

After a few seconds, he began. He knew I didn't need a build up, no foreplay had been needed either, he just quickly started pounding into me his hips colliding with mine, hint of knot bumping my clit with each pass, quakes of pleasure hitting me every thrust.

He began to pick up the pace, rocking my body with the fervor of youth. His tongue lagged out as he watched my chubby body quake under him. His hands found my breasts for balance as and he increased the speed more and more until I had my legs wrapped around his back.

He didn't like that, so he stopped, grabbed me by each ankle, and pressed my knees to my chest. I didn't know I was that flexible, but the sheer vulnerability of it, left me quivering. Then he thrust back in, hitting so much deeper, I was surprised the growing knot could still fit in.

He popped the knot back out to a squeal from me, and began to rut me proper. There wasn't much I could do in this mating press, so I rode it out, letting him slap my ass with his now too big to fit knot each time he filled me with his hot college pup dick.

I didn't have long, the pressure in my pussy was about to boil over. I was going to cum soon, and I needed to communicate my desires to him. He denied me that, by pressing down harder so he could kiss me, tongue immediately meeting mine, and my mind melted.

Then the knot popped in and my world exploded. We came simultaneously, and I had to wonder if he was into milfs, or wanted to make one, but that thought washed away into a sea of nothing but pleasure and need for wet sloppy kisses.

The click of the dead bolt on the front door brought us immediately out of moment. Apparently we missed the sound of the car driving up to park. I looked around for my clothes but quickly realized that we were tied together.

The door swang open, and Mop's Mother took two steps in before she noticed us naked, tied, and on the living room couch. She blinked, opened her mouth to say something, then closed it. She decided she wasn't surprised, it seemed, then closed the door behind her.

"Did you at least use a condom?"