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Keith always has trouble taking Lance’s werewolf cock whenever the full moon arrives. He can never fit it all inside without Lance’s help, usually getting about a third of the way in before his pussy starts refusing to take in more than it can really handle. Not that it matters, since he always tells his boyfriend that no matter what he better be completely full of that big dick by the end of the night.
His body should physically say no, but he really, truly doesn’t give a shit.
Which brings him to now; straddling Lance’s lap as his boyfriend squeezes his furry, clawed hands around his waist, forcing him to take what his body is having a hard time accepting. He whimpers as Lance steadily grinds the entirety of his cock inside of him, pussy finally able to take the full length of it after about a good full hour of prep, allowing him to adjust to his girth more before the real fucking can begin.
“I’m ready…” Keith whispers, body shaking in anticipation as he rolls his hips seductively back and forth on his boyfriend’s monster sized dick. The stretch of the werewolf’s too big cock in his too tight pussy borders just so on the side of painful more than pleasure, and his cunt is fucking throbbing, but he wants to get fucked now, wants it bad.
God he wants it so fucking bad.
“Go ahead,” he says, clenching his hole twice around Lance in encouragement.
“Please," he whines, kissing Lance's wet snout, petting through his boyfriend's thick brown fur. "Please. You can fuck me now.”
With a grunt, clawed hands lift his trembling body, slowly dragging it up and up and up—
And then dropping him down, hard.
Fast. Almost too fast.
Keith squeals and gasps, eyes crossing, legs jerking and toes curling as his body is violently speared open.
Right away, Keith feels himself start to lose his sanity as Lance immediately starts hammering into him repeatedly, the pace animalistic and brutal. He feels like his insides are getting all mixed up together, like maybe he'll actually fucking die this time around as his body is forcibly shoved up and down the obscene length of Lance’s thick, wolf cock. He feels like his head is going to roll right off his shoulders with how hard his body is being jostled around to Lance's own carnal pleasure.
Keith’s pussy is wet and stretched enough that it's somewhat of a smooth slide, but even then he makes pained noises in the back of his throat, like a wounded animal, face scrunching up at the large intrusion. Every time he takes that fat cock all the way to the very base, his dick and pussy lips rub against the wolf's fat knot with each hard pump, reaching a spot so impossibly deep inside of him he can feel it start to creep up into his throat. The outline of Lance’s cock becomes visible through Keith’s belly, bulging it out, reshaping his insides. A shaking hand tentatively moves down to touch it, and Keith groans when it bumps against the palm of his quivering hand over and over again. It’s so lewd, seeing the length of it disappear and reappear with each hard thrust, so deeply rooted in Keith’s guts that it has to hurt. He'll never get used to the sight and feel of it.
They always have to force the huge thing in Keith’s ass or pussy whenever they fuck during the full moon, and Lance tends to forget how violent he can be while having sex during those nights.
He also tends to forget just how hard headed and relentlessly horny his boyfriend becomes whenever it comes to having sex with Lance in this form.
Not that any of it really matters anyways, the only thoughts in Lance's head during those times always being to breedbreedbreed every time he zeroes in on the way the dark red of his cock splits Keith’s deliciously tight pink pussy apart. Lance growls at the sight of it, tongue lolling out between feral pants as bright blue eyes flash at how the skin is stretched so thinly around his girth, each rough thrust bumping against the depths of Keith's body. The plushy head of his cock violently starts kissing at the the small opening inside and Keith—
Keith throws his head back, eyes rolling to the back of his head as he starts screaming. He sobs in shock as Lance's cock keeps slamming up hard against his cervix, fat tears rolling down his flushed cheeks at the persistent stimulation, thighs shaking and hands scrambling around for— he doesn’t even know what— as he suddenly squirts so hard Lance’s dark brown fur becomes soaked with it.
At that, Lance growls, jaws gnashing together at the primal urge to bite and mark his mate. Instead he licks at Keith's reddened cheeks and laps up at the salty tears with his large tongue. His pace becomes more erratic as he continues to use his boyfriend’s cunt like his favorite little fleshlight, pounding frantically away at his pussy well past the point of over sensitivity, until Keith’s hole is so tight and sore it feels like his body’s going to be snapped in half under the force of Lance's violently hard thrusts. Lance’s clawed grip around Keith’s body tightens, thumbs pressing over his own cock through Keith's skin each time he pumps his hips up faster and faster and faster into the tight give of Keith’s trembling, wet cunt. The sound of heavy balls slap the back of Keith's ass as their thighs clap together, the damp plap plap plap sounds echoing obscenely in their bedroom bathed in moonlight.
It’s then that Keith passes out with a pathetic groan, pussy full as his body goes totally limp in Lance’s arms. The wolf inside of Lance is proud that his human boyfriend can always take so much abuse to his hole like a proper bitch, and the sight of Keith passed out, tears and drool and sweat on his face, and body so light and pliant while being fucked like his own personal cock sleeve—
It makes the animal inside him want to fuck him all day, every day.
Makes the wolf inside of him go feral at the thought of breeding his pussy and properly knocking him up with his pups til his stomach and chest fill out.
Lance knows it's impossible, instead settling for grabbing the unconscious man and grinding his cock deep inside of his pussy, intent on coming until his balls are completely empty, til Keith's belly bulges out even more with all of his hot seed.
Soon enough his knot thickens up, eventually shoving completely inside with filthy pop and a loud roar as Lance creams up his boyfriend’s sweet little cunt, dead set on breeding him properly.
Later on when Keith wakes up, face pressed down in the sheets and ass raised up in the air, he is immediately overwhelmed with the heaviness of cum inside of him and the feeling of Lance’s big body humping savagely away at his throbbing, oversensitive pussy. A mix of his juices and Lance's thick cum make a frothy, bubbly mess of his cunt, thighs, and the sheets below him, staining them with white.
He moans brokenly with each harsh thrust inside of his spent body, little uh uh uh's escaping his slightly parted lips as he's railed into.
Despite knowing he won't be able to walk properly for a couple days, he grins happily.
It's going to be a long night.