Losing your "boyfriend" to dog cock
It'd be wildly hot if it was gradual. You think everything is fine in your relationship meanwhile your boyfriend is staring at your newly adopted mutt and biting his lip. When you're in the kitchen cooking for the two of you, he's in the living room on the couch leaning closer and closer until the pup is licking against his slightly parted lips. Ignoring your voice as you call out about making a plate of food for him, letting that big, long dog tongue push deeper and deeper, sucking on it and feeling an obscene heat radiate from his crotch.
He's almost too lost in the taboo kiss but he catches the sound of footsteps and pulls away in time, the mutt crawls closer dragging it's hot, eager tongue across his cheek and neck. His hands find his furry chest and feebly push him away just as you walk in with the food.
"Awwww, you two look so cute together! He likes you so much already! And you said you didn't want, what was it you said, "a dirty mutt" in our house, looks like you changed your mind huh babe!" Your boyfriend blushes brightly at your observations. He hopes you don't notice how his hands shake when he takes his plate from you.
Two weeks went by without another incident, maybe it was just a fluke, a brief lapse in judgement. That's what your boyfriend tells himself until the dog hops up on the bed... He silently curses you, he had said he didn't want the dog to get in the habit of sharing the bed but you're the one always inviting him up. So now here he is, confident and self-assured as he jumps up and settles down right onto of him.
His heart races just from the weight alone, he's so muscular under that soft layer of fur. Of course, he was lying in bed shirtless so there's no buffer between his flesh and the pups. Their noses are sooooo close again, he can feel its hot breath puffing in his face over and over. To your boyfriend's credit he tries to push him away again, only opens his mouth to say 'No, go away...' or something to that affect, but that just made it easier for the dog to slip him its tongue once more which melted his brain near instantly again. He's not sure when he started kissing back, or moaning, or wrapping his legs around him or humping up against that strong, warm body keeping him pinned to the mattress...
But he heard the sound of your feet coming up the stairs... somehow despite how dizzy he was. He let his body relax, laying limp once more but kept kissing the dog, tempting fate. The stairs groaned, cracked door creaking on its hinges as you entered. You were distracted, more interested in hanging up your coat, kicking off your shoes and peeling off your work clothes, you barely looked at the figures on your bed. As you move around the room you roll right into venting about your day.
"You two look cute cuddling. I grabbed take out on my way home, there's some in fridge if you're hungry later. Work was crazy as usual, so, you know the new guy, right? So, he decided to..."
All the while your boyfriend is quietly kissing your fucking dog right in front of you. And they don't stop as you move into the bathroom to wash up, it only ends when you tiredly toss yourself on to your side of the bed spooking the mutt enough to jump off and sneak back down the stairs. You roll around to get comfy and lay a hand on your partners chest telling him sorry you interrupted them never fully noticing his dazed expression as he licks the drool off his lips.
---
Another week passes before they do anything else, but your boyfriend has been jacking off more, unable to look at the creature that's been driving him crazy without leaking through his boxers. He doesn't understand why it's happening, why he seems to want it so bad, but he's hoping he just needs to get it out of his system...
Yeah... that's exactly what he tells himself when he catches the mutt licking himself, tapered head poking out of his sheath as he drags that flat tongue across it. That same tongue that's been burned into your boyfriend's memory and keeping him up at night. He's staring, getting wetter and wetter, lost in thought again he didn't even mean to get on his hands and knees and start crawling across the floor. Suddenly his own mouth is barely an inch from that hot, red flesh. The dog encouragingly licks the corner of his lips in a well-practiced motion.
He lets his tongue dart out, fast. Fast enough he can convince himself it doesn't count. He's not doing anything wrong. Which means it's fine if he does it again. And again. And again, but this time he lingers. The dog huffs against his cheek and takes another swipe at his cock as if to show him, 'Like this, dummy. Feels good like this!' So, he feels compelled to linger longer, licking harder. Their tongues mingle along the growing shaft, and he finds himself shoving his hand down his shorts.
The dick gets longer, thicker. How fucking big is it. He wants to feel it in his mouth, his throat... why would he want that though? He instead just licks more fervently, he can't blow his dog, right? But the mutt huffs against him again and he feels his hind paw strike him in the head. Not hard but enough to get the idea 'This isn't working, I'm getting annoyed...' Is a fucking dog telling him his head game sucks? He swallows hard as his ego burns.
Now his lips are wrapped around that sticky hard-on and the dog practically yelps. He feels pride threading through his chest, placing a hand on that fluffy belly, the other helping to control the leg that keeps kicking. The way it throbs against his tongue is driving him crazy, his hips humping the air wishing desperately to get some real friction. But that will have to wait, he's determined now to the give the mutt the best nut of it's life, just this once, right? Just the one time... -mmmph, shlcck, ghrlk ghrlk, mmm- yeah, never again...
---
It's been weeks and he's giving the dog a blow job at least once nearly every day. He can't seem to cum without feeling its mutt nut clogging his throat and soaking his tongue. More than that it feels so good to take turns, that fucking tongue. He knew that fucking tongue would be the ruin of him. It drives him wild to feel it reach so far up his cunt, making him soak that studs muzzle in his own cum then turning around just to lick it clean and start all over again. How you haven't noticed their antics, who knows. So much more preoccupied with work or gaming with friends. In any case you never even hear the disgusting, sloppy sounds the two are always making together, growling and moaning with abandon.
It was after they sixty-nined for about two hours that your boyfriend was dutifully cleaning up the mutt's muzzle again, kissing him passionately when he felt the tip of that not-yet-satisfied cock poke his hungry slit... He licked faster... um, to hurry and get him all cleaned up so he could push him away, but, oh darn, he didn't finish soon enough and now that mutt cock is digging deeper into his cunt. His hips roll and he's certain it's already up against his cervix. Guess he -hnng- just has to endure it for a little bit until he's done cleaning up the mess he made...
The make out like a couple of whores as the pup finds a rhythm that takes his breath away, pounding into his swollen, sopping pussy like he fucking owns it. It pulls sounds from him you never did, filling him up with a sickening, addictive pleasure he hates himself for, and yet, he hooks his ankles around the creature ruining his fucking hole. Reshaping it for dicks like his. His knot balloons out of his sheath and plaps against him but it's simply too big to slip in at this angle. He doesn't even think about it, he just knows something hot and throbbing is meanly grinding on his t-dick with each stroke and he fucking loves it...
---
They shouldn't have done that, fuck. He shouldn't have done that. What was he thinking?? Was he thinking? What was it about this mutt that makes him so stupid? So horny... so... fuck. He's biting his lip as he watches the two of you frolicking around the yard, his eyes glued to the bouncing balls hanging below the ass he ate last night rather than the ones you're throwing for his lover to catch...
That's not his lover, what is he thinking... you're his lover, r-right? But you've barely kissed all month, mostly because he's afraid, you'll start asking about the musk tainting his breath. That's it. He has to put a stop to this. And surely, he knows just how to do it.
He has to wait a few days, until you have to stay home late at work, that gives him plenty of time...
---
So, there he is, helping the mutt line up its cock. They're in doggie style, a position he'd been avoiding but now he's certain this is the only way out of this fucked up cycle he's got himself into. He just needs to feel this thing, just once. To satiate his morbid curiosity, and then he'll go back to being a model boyfriend. As opposed to some mind broken pervert addicted to debasing himself for a fucking four-legged bastard...
The mutt sets a brutal pace as per usual, railing him hard enough he can't hold himself up, arms buckling and forcing him to rest his chest on the cold tile floor. (It's easier to mop up the floor fast than wash the sheets he learned.) He hears that same 'PLAP PLAP PLAP' that was specifically that fat knot knocking on the entrance of his slit. He grunts, shifting his legs wider, reaching back and trying to spread himself more, he wants it inside. It's wrong and he knows it, his body knows it's wrong, as it resists the inhuman shape, firing off signals in his lust addled brain to stop, this is too far.
He bites his lip as his vision blurs, the most deplorable part of his mind grows louder, louder than the common sense that's being fucked out of him anyway. It's warming his body, sending wave after wave of thrilling pleasure as it becomes more solidified in his mind that he wants to be ruined. He wants to be a brain dead knotslut. This isn't a onetime thing. It's the beginning of his new life. His new purpose. His lover drapes himself over his whole body, ramming his full weight, his muzzle is just close enough they can lick each other just how they like to. The knot is sliding in just a little more with each slap of their hips, he's not around the widest part just yet but the stretch is fucking delicious, he feels filthy. Disgusting. But the best is yet to come, they're going to be tied soon, his toes curl at the mere thought. Feels so good, soooooo good...
So good he didn't hear the footsteps up the stairs this time, the jiggle of the doorknob, the creak of hinges... at least not until it was too late. His eyes grow wide and frantic as he lifts his head up to lock eyes with, you, his bewildered boyfriend. You stare, not believing what you're seeing, jawing working up and down soundlessly like a dummy with no ventriloquist.
Your d boyfriend is in about the same state, shocked to see you home so soon, mouth opening to spill out excuses but instead just filling the room with more breathless whimpering and grunting. It sounds like he's trying to say, 'sorry' or 'stop' or 'help' even, but in a split second all that fear, remorse, and shame... is gone. You got to bear witness to the very moment that knot pops all the way in, tapered dick finally bullying its way past his cervix stirring up a part of him you never even thought to touch. The second that mutt locks in, your boyfriend's face goes from tense worry to utter whorish relaxation, eyes glazed and unfocused, tongue hanging out and slopping drool wherever. Lips drawn in a goofy, mindless open-mouthed smile... you're stomach flutters, he looks so happy like this...
---
There was no getting him back after that. Now when he tells you he's sorry it's while he's fucking that mutt and saying things like, "sorry my new boyfriend's dick is so much bigger than yours, you're not mad right?" "Sorry he's eating me out under the table again, he's such a hunky boyfriend, he always knows what I really need." "Sooooorryyyyy he knotted me so good and dragged me onto the bed and we made a mess on your side; he's just such a good boyfriend making sure I'm well bred. <3"
You're not sure why you're living like this. Your partner isn't yours anymore and never will be again. But you don't move out. You float around the house like a voyeur watching them breed nearly every day. It's hard... hard not to stroke your meat raw to the displays of depravity constantly in front of you. Watching that knot, the size of your fists folded together, plopping in and out of your ex and breeding yet another litter into him. You cum into your fist every time you think about the fact his pussy wouldn't even register your straightlaced, little human dick. He used to say you were so big... but now? He's addicted to his womb being invaded, cunt gaped so wide you can look inside and see his twitching cervix, kissing at the musky air of his pussy and begging for more doggie nut sludge.
Sometimes they let you worship the knot that stole your boyfriend from you, the one that molded and owns him now. You tongue at it as it pounds him ruthlessly, catching all of their filthy juices in your mouth and on your face. Hand stroking yourself the whole time as your own mind fuzzies in the face of this beast's breeding parts... The more you slip the more you forgive your ex... you even start to wonder if they'd be up for an open relationship.
