FSE

Furry search engine

formerly SoFurry search engine

(M tf Dog)

Marc and Grace had a nice dinner- a nice change for them both. This was their first meeting; both had spent some time on dating apps trying to find someone for them. You either meet someone who looks absolutely nothing like their profile image, or they have a great personality and look hot but you don't much care for their mugshot on the police profile you looked up on the side to find out they are a convicted murderer. So a nice dinner is definitely an upgrade from the usual.

Marc had been single for some time though- so he had goofed up his last few actual chances of love for trying to push the relationship too fast. Grace actually had the opposite problem with her last few. They leave all the choices to her, they are too timid. Grace likes to get kinky, but the boys she has been finding are too timid and she would likely have just scared them off by revealing how she usually has her fun. She has an entire closet dedicated to various sex toys. Both her skin and her hair are almost an identical color of red clay. Marc has a lean, but athletic build and dark peach toned skin normally- since it is summer it has tanned bronze. His dick may just be average in size- he is confident in his usage of it, and isn't afraid to use his tongue to warm a girl up.

Grace smiled as they walked out of the restaurant. "Well that was nice- for a chance. I seem to intimidate a lot of the men I find on the app."

He let out a single laugh. "Well, I have nothing against a stronger woman."

"Oh really?" She stood close to him, so the fronts of her D cup breasts brushed his chest through their shirts. "You want a dommie mommy?"

"Hah...heh, sure. I am down for all sorts of stuff. I-if you are, I mean."

She licked her lips. "Oh I am actually. You mean it, though? You wouldn't mind actually being a woman's sex pet?"

"It- uh, well, if it made her happy. I mean- it isn't like, a fetish I have or anything. But I would be willing to, you know?"

"Well then." Her smile widened. "Wanna go back to my place?"

Wow, on the first date? That was surprisingly easy. Almost... too easy. Once they got to her place she darted to her room to grab a few things before returning to him on her living room couch. She plopped a sphere shaped device down and then a large book of spells. Magic kits are usually super expensive, so he is surprised she has one. They are not too common even though theoretically anyone could get one and use it. Technically you could also do it yourself for free- but actually learning the ins and outs of magic fully yourself is very difficult. She already rolled a mana crystal in her palm like she was about to cast it already and Marc actually looked at the page- and noted its transformation spell. She was going to change his physical body.

"Woooah- woah wait a minute."

"What?" She pouted. "You said you wanted to?"

"When you said sex pet I didn't think you meant quite that literally." He motioned to the open page. "That is a dog transformation spell."

"Oh. Yea. I mean- we can go that far if you want, but that wasn't what I had in mind."

"Wait, what are you casting then?"

"That spell- but not the entire thing. I am not giving it enough energy to actually complete the spell in the first place. See, you can project the traits onto a person, or reconfigure the person. If you project the traits and then stop part way you get a functional hybrid." She gently cupped the crotch of his pants and smiled at his dick twitching from her touch. "But that means if I layer canine dick traits onto the penis you already have, it increases its size by making it the size of a dog AND a man."

She cast the spell and Marc squirmed from the feeling but surprisingly nothing seemed to change physically. His penis stuck to maximum hardness- which generally it only hits when it clenches while already normally erect; but right now it just held at that firmness. It was almost achingly erect, but it did not actually grow. Grace sat over him now, placing a knee on either side of him on the edge of the couch and pulled her top off and unfastened her black lace bra. Usually the nipples and areola are darker than the normal skin color- but similar to her hair; they match the rest of her skin almost perfectly. The only way to tell where the areola is, is that it has bumpier skin, it's otherwise camouflaged perfectly. She opened her jean short-shorts revealing she had no panties on under it- as soon as she flapped open the front he could see the small bushy tuft of hair and her dark pink clit standing watch over her fat nether lips.

As soon as he seen her pussy- already fluffing itself up in arousal- his penis started to change a little. The veins became smaller on its surface, but also split to become more numerous on the surface. His urethra started to stretch longer than the dick housing it- causing it to project out a bit. It needed to steel flesh from the glans to properly house it though- so the further his urethra projected the flatter the slope of his glans' dome shaped head became. She undid his pants and pulled his junk out- using his balls to keep the pants held down while she admired his cock for a moment, placing her index on the frenulum and nudging it softly forward to let it spring back. He groaned and leaned back in the seat fully as his cock became so achingly tight. An itchy pressure inhabited the base of his foreskin, and the foreskin started to draw further down, bunching and thickening while the rest of his shaft progressed forward- dividing.

He was about to comment on its shape changing too much, but Grace prevented him from saying anything when she lifted up off his crotch, but leaned forward to do it- slapping him in the face with both her tits before sitting back down on his dick! When her pussy stretched around it, the shaft throbbed powerfully! It got thicker and longer- and changed shape a little bit more all at the same time! Five and a half inches was the starting line- by the time she sat on him he was six and a half. Then quickly seven, eight, and nine inches long! She just gyrated her hips on his lap, humming in arousal as she felt him digging deeper into her hungry pussy without either of them moving! A dog the size of him would actually have a dick larger than his- so layer them together, you get a cock more than double his original size.

Grace leaned forward and smothered his face in her breasts as she put her hands down his back from over his shoulders and just bobbed her bubble but on his lap, already making set slapping sounds as their combined lube pooled on the divot between his balls before running off. The skin on the surface started to redden as the veins became tiny, like millions of little dark purple hairs. The base of his shaft throbbed with impossible pressure- and with each throb a swelling mound grew on either side, developing toward a knot. Ten inches long, his foreskin is three times as thick but now does not extend even half as far out as it had before... effectively becoming a hairless sheath. Eleven inches long, his glans do not keep up with the thickening of the shaft, causing the corona to equalize with it, and the domed head becomes completely flat as the urethra now projects in a rounded spike off the front on its own!

The new flesh that peeled away from the foreskin as it transformed into a sheath was very sensitive- as sensitive as his corona had been, causing his pleasure to spike too high for him to resist and he came explosively after not very long at all. Grace had to lean heavily forward and shove her butt back- dragging her clit into the crook of the base of his dick and torso to grind herself to a mini orgasm before he went soft.

She clenched hard on his dick before slipping off- sucking moisture off it with her pussy in a final tease of pleasure before popping out. He was going to comment on his junk devolving too far into a beasthood but when he looked at it- he seen it had not. When he hit climax the canine traits melted away again. It remains bigger than it had been before, but not as big as it was when inside of her, and not the slightest bit canine. It also did not start changing shape till she started to disrobe... she made his arousal the trigger. Once she helped him clean up a bit though, she opened that sphere she had with the book. The sphere is apparently a charging bay. Inside is a ring of rubber with tiny mechanizations embedded around the outside.

She held it up over his dick while holding the now flaccid dick up with a crooked index finger. "And now for the dom part of the deal. While we are together- your dick will belong to me, okay? This little toy will ensure you always have a good time... but, I am the one who controls it."

The ring is remote controlled. As soon as she placed it onto the head of his penis it started to vibrate powerfully, and immediately fired itself down his shaft! The pattern of the vibrations are a screw- when it vibrates it also climbs down his shaft to ensure it does not accidentally start to squirm up the shaft. It also means that while it is vibrating, it is impossible to take off. It is both a really loose cockring, and a vibrator at the same time.

And so their new relationship began. Marc thought it was kinky and wearing the ring all the time was like a constant reminder that he had Grace waiting for him when he got off work. Occasionally she would tease him though- sending him a flirty text message and the moment she sees he read it- she turns the ring on and forces him to a full erection while at work on his break, then turns it off again before he starts leaking. It made his balls feel so full, and he was so needy by the time he returned to her. Balls aren't really meant to store much cum- most of what they make, they make on the fly. But she keeps pleasuring and arousing him and then stopping- so his balls keep preparing more without getting rid of any.

Grace keeps the toy on even when they have sex- since it's a vibrator it pleasures her just as much as it does him when he shoves it into her. That means she can also control his peaks while having sex- firing him toward orgasm in the blink of an eye but then cutting off abruptly, then slow riding him till he tapers down to a normal level and then she turns it on and fires him back up to the edge! When they fuck, his arousal turns his dick mostly dog again, and an achingly hard 12 inch pillar. This time however; while he was bouncing her off his crotch thrusting under her- he felt his tailbone growing out! It surprised and worried him but he was far too caught up in the pleasure to say anything- he NEEDED to get off first! By the time he finished it was starting to grow a peach-fuzz coating of fur! When he hit climax though; it regressed entirely, eliminating the problem.

What Marc did not notice however is that his dick looks very veiny on the surface, and is nine inches long with a very slightly projected urethra. It didn't regress entirely. He was so happy from the sex and pleasure, and seeing his temporary tail vanish again that he completely missed the fact his dick did not turn entirely human again.

This continued for the next three days. Even in past relationships he had; he never had sex every day! And thanks to the magic and unique toy- it was blindingly explosive every time. He noticed he was getting a bit harrier though- perhaps a side effect of the frequent sex causing his testosterone levels to spike? He now had very hairy patches on his body- his chest, his forearms, shins, and his pubes now trailed up to his navel. He however failed to notice that the hair was golden blond which is lighter than his hair is supposed to be- and it is abnormally soft... it isn't hair, its fur.

She teased him one morning when he was trying to go to work. Just a soft little rumble here and there as he woke up, but then a few stronger vibrations. His hips pulled back as it vibrated powerfully in the bathroom till he started to drip pre, then stopped abruptly again. The more aroused it made him the more his dick enlarged, and the bigger it gets beyond his default erection- the more canine it gets too. She ended up making him too horny to go to work- he was already dripping, his dick already bloated at the base from a forming knot, his foreskin peeled unusually far back and his dick hovering a bit over eleven inches. He tried to masturbate to get himself off- but she knew about it, and caused the ring to shrink! It squeezes his dick so hard all the veins bulged and the shaft turned red at the middle as it bloated wider and dark violet toward the head where the blood pressure got trapped.

>Ah, ah. No getting off without me.

>I have to go to work!

>Not really, just call in sick. If we are together- you technically don't need to work at all. We don't need two incomes to survive off of. If you want pure pleasure, you can drop the job entirely, I don't mind paying.

>Aha... nice offer, but I think I will keep my job for now. So, you want me to come over right now?

>Up to you. What do YOU want?

She caused the ring to vibrate, loosening a moment before squeezing again.

>Be there soon!!

The ring loosened its grip to normal so his dick didn't look like it was about to pop like an overinflated balloon- but even at its loosest it still hugs his shaft enough to slow the outgoing blood, making losing an erection difficult. His dick enlarges with his arousal- so while the ring is loose on his human penis; he grows to a size where it always hugs the shaft. It is also very taut and very sensitive flesh- a canine phallus is meant to live in its sheath, so the entire shaft is very sensitive to the outside world. He cannot get rid of the erection himself or the ring will try to strangle his dick- and it also hums to keep him aroused at all times so the erection will not fade naturally, either. When he gets dressed his cock is tall enough that the end of it is under his shirt- not his pants. Even standing upright- the tip of his dick rests on his lower rib cage. Even his balls are larger than normal, and the hair normally on his scrotum is now softer, shorter, and denser- transitioning to fur as well.

She answered her door already not wearing anything but a loose t shirt, and he was so ravenously horny he half-grabbed her and half-tumbled into her, both stumbling to the floor and he immediately started pounding her doggy style! She giggled and cooed in arousal as he energetically fucked her. His tail quickly emerging, curling as the fur grew out, forming into a huge ball of fluff from it curling up onto itself. Fur started to grow on his upper back! Fat deposits pushed on the skin of his inner hands and feet, starting to slowly develop paw pads! His nails darkened as the keratin layers thickened. He was panting like a dog by the time he climaxed, and she cranked the ring to max causing his orgasm to double-over itself, extending the length with the sharp pleasure.

Both he and the ring tapered off, but the ring took longer, causing his dick to remain at half-chub. He tried to clean himself up but the ring still had not stopped its gentle vibrations, so touching himself to try and clean off returned him to full erection. He also hadn't noticed the dog traits were still present. Grace noticed- and immediately offered a solution to help clean him up and settle his member as she pushed him onto the touch cushions and knelt in front of him to suck his cock. It is too big to take in her mouth- in order to take it all she has to put at least a third of his entire cock into her throat. She cradled his balls in her hands as she did it, smiling around his cock. Marc's head was tilted back and his eyes closed from the pleasure so he didn't notice his balls swelling much larger and the fur envelop them entirely. His ears became pointed and his lips turned glossy black!

His balls lifted themselves out of her palms and bopped her chin as he came explosively a second time. Like any muscle- the more you use it, the better it adapts to being used. She is training him to fuck more; his second orgasm was barely any smaller than the first. This time however his added canine traits regressed and he went soft finally. Except now he still has a short, naked nub of a tail, and he still has a patch of sparse fur on his upper back!

So he took a sick day, and then another. He noticed his fingernails turning dark and thick, but she told him it was just the spell and would regress when he was no longer aroused... and he quickly forgot about it. The problem of course is that she is always keeping him at least somewhat aroused. The reversion is not instant, and the more there is to revert the longer it takes to go completely back to normal... so if she keeps turning him back on before the last changes revert- he slowly starts to tip further toward dog. He can go completely human if he remains unaroused... except Grace is in charge of when he is aroused, and she isn't letting it regress.

By the fourth day he did not call in sick, nor did he go to work. Grace kept teasing him and pleasuring him and he forgot he even had a job to go to in the first place. He wasn't even going back to his own apartment! Grace brought him home a new 'choker' as a gift... though it was quite obviously a dog collar.

His dick was always kept at half-chub at the least, never fully returning to sleep in its sheath, so he forgot how big he is even supposed to be! Turning completely back to human would mean his dick shrinks, and he doesn't want that! Grace riled him up as soon as she wanted him to plug one of her holes again, and just giggled and moaned as he tackled her like a beast to fuck her wherever they happened to be at the time. The counters in the kitchen, the couch in the living room. The shower, the windowsill nervously watching if anyone will spot her tits bouncing around in plain view of anyone who can see the window. Morning, day, night; it did not matter. Even when she went to work, she still has the remote- she still controls his cock from wherever she goes. She even made a game of working him up and down for a long period of time, both seeing how long she could edge him before his dick became such a hair-trigger that he explodes instantly; but also how far she can get him to fire a rope of cum after edging for so long. Turns out- longer than her couch at least. A foot into her living room to almost the wall on the other side- and that is the biggest room in her apartment.

Marc was panting one night watching TV with Grace, but his dick bobbing and drooling pre on itself. Her training had shrunken his refractory period to much a minuscule period of time that he returns to an erection without her even turning the ring on most of the time- from either watching her prance around the apartment barely dressed, or some good looking woman on TV. Grace looks over and smiled at the twitching member before grabbing it like a joystick.

"Ooh my pet wants to pop~."

"Nnngh... not meant to be dog!"

"But you wanted to be my sex pet. And you wanted to have a bigger dick."

"But.... nngh...mmmm..."

"But?"

"Huh? Oh. Uh.... dick... separate. Wanted bigger without be animal..."

"Well if you don't get aroused, you'll lose all your animal traits if you really want."

"But I would also lose size..."

"Ah- good point. Hold on, we can fix that."

Grace left for a minute and came back with a different spellbook, plopping it down onto the living room table- the tome is so large the surface of the table wobbles from the weight hitting it. This book was on human biology and altering it with magic. She has a lot of sex toys you see- but using a dildo and having a flesh and blood cock explode in you just isn't the same. She is used to some extreme sized toys, so she can bury his bone easily. Grace could get human cock, she could get dog dildo. She could make a giant human cock... she cannot make a giant dog cock. That would both require a dog which is already morally questionable, but also because of that- there are no hyper growth spells that work on animals. But there is hyper spells for people. So if you turn a human into a dog while the hyper spell is already active- you get your work-around.

Marc misunderstood the offer- with the constant hormonal flood degrading his intellect he immediately assumed she was offering to enlarge his dick minus the dog traits. What Grace is offering is enlarging his dick separately, with the dog spell remaining active. She wasn't removing the existing spell, she is just adding another.

Grace cast the new spell while knelt in front of him on the floor in front of the couch. She smiled as he groaned and his balls gurgled audibly, bouncing up and down a bit, squirming in the scrotum as they started to swell larger! Grace cupped the bottoms of them as they grow- the fruit of his manhood ripening before her eyes. To him it was an immense pressure inside. He had just cum half an hour ago and it already felt like it had been years since he had sex last. His taint throbbed and his prostate pulsed, firing short lived jets of salty pre! Grace bent his dick forward and sucked it down. She did not want her pet to waste all that warm salty goodness. Grace put her hands on his inner thighs, lifting her tits up so his still enlarging balls rest against the tops of her breasts. Now when his balls clench and release they send small ripples through her boobs when they hit back down!

Marc became breathless as he pants, he cannot stop groaning and grunting from the sensation. His shaft is so fucking tight, so bloated full feeling! The subdued knot started to swell larger than it ever has, developing further! The growth is causing his arousal to go up higher than before- which also causes his canine traits to progress further! His nails dig into the arm of the couch as they stretch into blunt black dog claws! His dick nudges the back of her throat and then starts to push her head away! Reddened skin starts to expose itself as he outgrows what she is physically able to take into her mouth- even while deepthroating him! Half an inch, a full inch, an inch and a half exposed! As it was also getting wider- even the length she could already take started to shorten because it was getting too wide to allow that far in!

"A-ah t-t-too dog! Nnnngh. Too big too dog too horny, need cum!"

She finally gave up trying to popped off his dick, wedging the end of her index between the blunt end of his shaft and the back side of his urethral procession, bobbing his dick by it. "Well you get more dog when you get more aroused- you already know how to fix that part."

"B-but nnngh..." He squirmed in his seat and the ring vibrated- but when it vibrates it shifts down his shaft! This caused it to stretch overly tightly around the mid-point of his forming knot. "T-turn ring off!"

Grace held up both her palms to him with a look of mild surprise, showing him she does not have the remote. Oh great, she lost the remote?! The ring is too small to have buttons or switches on the ring itself- without the remote you cannot deactivate it. And while it is vibrating you cannot slide it off because it will be actively pulling itself down with the same force. The forming knot is causing even more new flesh to peel away from the inside of the sheath as the knot is forced out from a lack of space, which means the ring just keeps dragging itself further down! It is practically strangling the knot which is far wider around than the ring was ever meant to contain.

"Well, if you cum it will go down on its own, right? Here- that looks uncomfortable, lets fix both these problems for my little pet~."

She rubbed the sides of his knot which was even more sensitive than the rest of the shaft- this caused his knot to swell and throb even larger and then it suddenly popped forward, shoving his sheath back to make room as it fully emerged- but this caused the ring to pop off the back of the knot and rest against the most sensitive part of a dog's phallus- the underside of the knot. But that means it is also inside of the end of his sheath, completely hidden under his skin! Well now it's really impossible to get off. Even if it stopped vibrating- the knot is far too large for it to fit around, you physically cannot remove it without getting the dick to regress first. You can't even cut the damn thing off because it's trapped between two layers of skin.

While her mouth is limited, Grace proved the flexibility of her other holes as she stood up straight and confidently skewered herself on his throbbing meat pillar! The shaft bloats widest toward the end before tapering off- so if you ignore the pointed tip and knot; the shaft itself is sort of shaped like a club. The knot went from a huge bulge to looking more like an actual knot- the round curvature transitioned with a steep edge against the rest of the shaft- looking like two giant eggs below the surface because the knot compresses in on the top and bottom to allow the urethral bulge to pass over it uninterrupted, and the primary artery on the back of the cock to let blood flow in freely.

Grace cooed as she stretched herself around the wide end, then enjoyed as it easily slid in on the narrower base of the shaft, then her labia and clit squashed up against the front of the immense knot! Grace grinds up against the knot as the ring vibrates erratically on the other side of it. It does not even occur to Marc that in order for the ring to change intensity at all someone would need to be using the remote, which is supposedly 'lost'. Grace managed to squash herself hard enough on his gargantuan knot to get the first third of it in, but it's not enough. Her pussy starts to sting like a sharp cramp and she has to back off again. She is confident that she CAN take his monstrous knot; just not without working up to it slowly, and this doggy needs to blow, sooner rather than later.

The fur on his upper back becomes a dense mat. His ears start to change shape and fur starts to spread on it too. His hair becomes softer and its black coloration starts to lighten as golden coloration bleeds into it from the scalp up. His skin darkens in spots on his hands and feet as fat shoves itself into it to bloat up into pads!

Marc tried to get up off his seat and start slamming into her on his own but Grace was still confident in her ability to do this, and only had to nudge him with her fingertips to get him back into a fully reclined pose. He arched his back the other way as the ring started vibrating even stronger now! Grace slid off him- because his dick gets wider just before it tapers off at the end it went a satisfying wet pop sound as she pulled off. She turned around and sat right back down- this time driving into her ass! Her guts gurgled as the giant dog cock re-arranged her insides to make room, but when she managed to slide down to the knot- she had an easier time stretching her butt around it. Mega-sized buttplugs; she has been training for this.

Grace's feet were on the floor in front the couch, her legs between his. She leaned back with her hands on the back of the couch on either of his sides so she did not destroy herself sliding onto his cock too quickly with her entire body weight. She shoved down and forward to sink it in, using the angle to help ease it. A third of the knot again. Her pussy juice helped lube it up already at least, and he was jetting pre like a broken faucet at this point because the ring below his knot won't stop. They both groaned at the same time as she stretched to the halfway point.

"So... full. So fucking full, so tight and full and f-fuuuck yeaaAAAAH~" She abruptly popped the rest of the way down with a wet *shulk* sound! The knot is round- once you pass the halfway point it tapers off abruptly, causing the rest to pop in with ease on its own!

"Tight. Wet. Good, so good, so tight so- hoooh... mmmrrrROUGH!" He barked abruptly without even realizing- his teeth starting to sharpen now too.

It now could not move at all. It is so deep into her it cannot push any further forward, and the knot is so large it couldn't possibly be removed. So rather than pull in and out of her- it stretched all of her insides forward or back! The most sensitive parts are the front curve and back curve of the cock- and both are also the points that get rubbed the hardest when he thrusts once the knot is tied. Her ass is so full of cock and so close to her vaginal passage that it collapses her vagina to make room- the skin around the opening scrunched up around the dick so far that her clit can feel it still even though it's in the wrong hole. You can't miss her pleasure button if you hit EVERYTHING at the same time. Grace is so fucking stuffed full of turgid cock meat that she has to rest more of her weight onto his lap- her legs are starting to go numb because his cock is cutting off the blood flow to her lower body! His testicles are the size of soccer balls thanks to her hyper spell, so her clit grinds into the soft malleable scrotal flesh when she rocks her hips on his giant knot- pushing her pussy against the curve of his huge balls too. She squirt all over his furry nuts in two orgasms before he got to his- but it was hard to tell because her pleasure receptors are pulled so tightly that it sort of just felt like she was having an unending, uninterrupted orgasm the entire time.

When he climaxed his nuts hugged themselves to her pussy causing her to bow forward and squeal herself, and then let out a huff as her stomach churned! You could hear the roar of fluid in her guts and she started to feel stuffed! His dick is so far into her, and he came so much so hard he was filling her stomach, backwards! When she bowed forward from that, the ring at least turned off finally too.

Marc felt very horny and pent up still, but it was a huge relief to finally cum at least some of it out. His dick started to relax a bit, and then Grace went to get up and unintentionally yanked him to the front of the cushions when she stood! His knot is too big to remove! When they shuffled forward the ring started to move again- not a very strong vibration but a slow and steady one.

Marc groaned as his tailbone started to extend and grow fur as his tail returned. "Can't get out!"

"You are tied. I guess you are so large and were so horny that one orgasm wasn't enough. Unless you can deflate that knot we cannot separate." She shrugged, shoving her butt back at him then climbing up onto the couch for him to mount doggy style- basically using her butt to move him into position. "I certainly don't mind if you don't."

Although her legs are tingling now from lack of blood flow. Marc was too horny to argue and the ring was returning him to full erection regardless so he climbed fully onto her and started thrusting away. He could not actually pull out or push any more in so he was just churning her insides to get off. Because the knot was fully engorged already it did not take him long to work up toward an orgasm! His tail grew in fully and the pads fattened to full size on his hands and feet. As he approached his next orgasm his hands and feet started to stretch, drawing his thumb and big toe back from the others and his digits naturally scrunched up and together so only the pads could touch down. Fur started to grow on his knuckles and the backs of his hands and feet!

He erupted with cum again- once against squeezing her pussy with his balls from below even in this position! Grace moaned as he stomach burbled and swelled out into a soft dome! Their squirming had caused the ring to once again go dormant- Marc still did not realize the remote is under the couch cushion and he has been turning it on and off with his own movement. He waited a minute and then tried to pull out- he seen a tiny bit of his knot exposed on the surface before Grace's anus unintentionally clenched on reflex and he popped fully back in.

She sighed and then chuckled. "You have to wait longer. I think you are underestimating just how much blood that thing holds. If it wasn't magically sustained your heart would have exploded trying to manage it all."

He groaned, listening to the soft quiet clicks and cracks as his feet and hands started to deform worse, the fur starting to spread around the sides and onto his fingers- toward his wrist. He had to get out quickly or he would turn more dog! After only a half-minute more he tried to pull out again, and again failed. He tugged again, and again, but that caused her muscles to clench against the backside of his knot, sparking his arousal! His dick throbbed back to full erection and with a sharp whimper he thrust the other way on instinct- back into her. Starting to pant desperately he resumed humping her at full speed! He needs to get off AGAIN! She trained him to be able to fuck so frequently. To be a good sex pet!

His hands and feet kept deforming more and more, his lips turned back to glossy black. The fur on his upper back crawled up his neck. He hit a third orgasm and finally the last trace of his former digits were gone- he had fully canine paws on all four limbs! Grace groaned as her guts churned again, her belly swelling up even larger looking like she was pregnant now! She let out a belch on accident from air being forced out of her stomach, and she blushed immediately recognizing the smell of her burp as the scent of cum.

She dipped her butt down as Marc once again tried to pull out after two minutes, he braced himself on the couch cushion. A little bit of his knot exposed, a little more. He pushed into the cushion behind them now though- activating the ring again. The soft folds of his furry sheath started to jiggle from the ring trapped inside and he immediately went stone hard. His cock throbbed, his knot throbbed- and what had been exposed vanished again as his dick dragged the entire rest of his body forward to sink back into Grace's ass!

He growled and climbed back on to start thrusting into her again, her large belly sloshed from all the liquid rolling around in it, making her occasionally burp up the smell of cum. His thighs started to change shape, and then his hips abruptly snapped into a new form, locking him in as a quadruped! His pelvis became deep but narrow. His nose started to darken on the end, pushing forward and then his entire face started to push forward! He came again! The ring wasn't turning off though because he wasn't on the cushion it is currently under. He tugged back whimpering to try and pull out anyway- since he doesn't know how to make the ring stop, but the harder he tries to pull out the harder her anal muscles grip the underside of his knot- giving him more pleasure and making him want to thrust in more and more, till he wants to cum more than he wants to pull out!

His ribs click and his chest reshapes, becoming barrel-shaped as it now projects further forward than it does to the sides; the invert of a human chest. His shoulder blades slide further forward to the sides, fur connects from his arms to the patch that was formerly on his chest and back, now consuming his upper torso. From tail and crotch and the top of his back legs it wrapped around his underside. The fur that had been his pubes connected to the fur at the top of his torso first, but it quickly connected all the way around in shaggy golden fur. He came again!

Now Grace was leaned heavily forward, resting on her elbows. Her stomach so large and round it looked like she was full-term pregnant! Marc barely slowed down before resuming his frantic humping! It felt like his cock was growing again! Impossibly tight, impossibly full, bigger, harder, longer, heavier. Needier, stronger, more demanding. His cock controlled him instead of the other way around. Luckily in comparison to Grace his cock was not changing size at all. It IS getting bigger- but not in comparison to her. Marc's entire body is shrinking- which means his cock is growing to remain the same size, while the rest diminishes! Unfortunately for him that means that even shrinking himself down isn't going to get him any closer to escaping her butt.

Because her face is down and butt raised into the air- soon his back paws did not even reach the couch; which means that ring isn't getting turned off. Marc keeps getting furrier and smaller, while his cock just keeps swelling larger to compensate. His front paws could not touch the couch under her, then they had to grab her swollen belly. He came again, but this time did not even slow down, he was too horny- his junk is so enormous compared to him that he is horny enough to go again at any time with no breaks. Since he is currently trapped in the undulating walls of Grace's butt- he can't stop fucking. He is too horny to remember why he is fucking her in the first place. He completely forgot he was trying to get out of her to prevent from transforming worse, now he was just having sex to... have sex.

His giant balls actually hang lower than the length of his back legs now. He started to shrink too small to reach around Grace's sides, his front paws slipping back to her hips, and then her butt cheeks! His entire body was barely enough to wrap around the curvature of her butt cheeks. By the time he hit his next orgasm the congested feeling in his face went away- as his head finished turning into that of a dog's too. He did not look like a pure breed, but resembled a small terrier. Grace doesn't actually know- his breed isn't dictated by the spell.

Luckily the growth of his immense dong was unable to grow quite as big as he did small- so after his seventh orgasm in a row Grace was finally able to reach behind and pop him out- though it took a bit of effort still. By then she was physically unable to bend forward- her hardened gut so distended with cum she looked full-term pregnant with twins. She had figured out where the remote went only a short while into that session- but by then he was already plowing her so she couldn't exactly rummage through the couch to recover it till they were done.

A dog whose entire body, legs and all is about the size of a watermelon, trailing testicles behind it the size of a cantaloupe each with a sheath between its legs large enough to stand a 2L bottle up in. Take the ring off now? Nope. By the time the knot was small enough to pull the ring off around without making it engorge right back up again- it was tucked so deep into his sheath you cannot possibly reach. You'd have to rummage in the soft folds of flesh to even find it, and in doing that you will return his cock to an erection at which point the knot is too big for the ring to be removed anyway.

Well, he did say he wanted to be her sex pet. So she treats him as her good little doggy. He can turn back to human easily enough- just don't get too aroused and he will turn back naturally on his own. Although, at this point since he went all the way dog- it will take at least one full day to revert to normal. And a few hours at least of calm before he even starts reverting in the first place. And boy is he excited to see her when she comes home from work. She gets out of her work clothes and before she knows it he scrambles up onto her with his giant dick wobbling around slapping her inner legs till she helps him reach her holes. Ooohooo yea. Oh. OH, no. Stuck as a dog for one more day? Eh, 24 hours ain't that bad, especially when the pleasure is this good.

Then another day, then another day. Then she has a day off... another week as a dog. Invites her friends over because they don't believe her when she talks about her perfect new 'toy'. Another month as a dog. Too horny to wait for her to get home, humps his own face till it outgrows the length of his body, then slides his body on top of it while licking the shaft- dick so large it holds his body up off the floor and he blasts his load all over the house before she even gets homes. A few more days- each day- every day. Well, at least no one can argue he is a good pet, a great sex toy, and is probably never going to need to use that dating app again.