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His name was Rex. A big, heavy-muscled German Shepherd with a thick black-and-tan coat, intelligent amber eyes, and a presence that filled any room he entered. My roommate had brought him home as a “guard dog,” but the moment I saw the way he looked at me—calm, focused, almost knowing—I knew he was going to be something else entirely.
Every time she left for work or for the weekend, the routine began. I would close the bedroom door, lock it, and strip out of my clothes while he watched from the foot of the bed. At first I only let him sniff. I would get on all fours and present myself, letting his cold nose push against my cunt, inhaling the scent of how wet I already was. Sometimes I would grind back against his muzzle until I came, shaking, while he licked me clean. Other nights I would stroke his heavy sheath until the red tip of his cock emerged, slick and pointed, and I would press my lips to it, tasting the salty musk while he stood rigid and panting. I never let him mount me. Not yet. I was saving that.
Tonight was different. My roommate had left for a three-day trip. The apartment was silent except for the soft click of Rex’s claws on the hardwood as he followed me into the bedroom. I shut the door, turned the lock, and looked at him. He sat, tail sweeping once across the floor, waiting.
I took my time undressing. Shirt first, then bra, letting my breasts fall free. He watched every movement. Jeans next, peeled down slowly, then the soaked pair of panties. The cool air touched my bare skin and I shivered, already dripping. I could smell myself. So could he.
I dropped to my knees on the soft carpet and crawled toward him. His nose met mine for a second before dipping lower, huffing along my collarbone, between my breasts, down my stomach. When he reached the apex of my thighs I spread them wider, offering. His tongue dragged heavily over my clit and I moaned, hips jerking. He lapped at me with long, rough strokes, the texture of his tongue scraping just right. I stayed like that for several minutes, letting him feast, until my thighs were trembling and a thin string of my arousal clung to his muzzle.
“Good boy,” I whispered. “Now take what’s yours.”
I turned and presented myself properly—knees spread wide, chest low, cheek pressed to the carpet, ass raised high. The position left nothing hidden. My cunt was open, glistening, the little pink hole of my ass twitching above it. Rex circled once, then twice, nose buried between my cheeks, inhaling like he was starving. Then the mattress of his body settled over me.
His front paws clamped around my hips with surprising strength. The thick fur of his chest brushed my back. I felt the pointed tip of his cock jab blindly between my thighs, sliding through the mess of my juices, searching. I reached back with one hand and guided him, pressing the slick, tapered head against my entrance. The moment it found purchase he thrust.
The first push was brutal. He didn’t ease in. He drove forward in one long, powerful stroke that forced every inch of that thick red cock inside me. I cried out, the stretch sudden and overwhelming. He was thicker than any man I’d ever taken, the shape different—narrow at the tip, flaring wider toward the base where the knot already swelled. My walls fluttered and clenched around the intrusion as he began to fuck me in earnest.
His hips snapped forward with animal urgency. Wet, filthy sounds filled the room—skin and fur and the slick slap of his sheath against my ass. Every thrust punched the air from my lungs. I could feel the growing knot battering my entrance, demanding entry. It was already the size of a fist, hot and hard, and every time it kissed my stretched rim I moaned louder.
“Yes—fuck—take it—”
He growled low in his throat and drove harder. The knot pressed, stretched, burned, then suddenly popped past the ring of muscle and locked inside me with a heavy, irreversible swell. I came instantly. My cunt seized around him in violent pulses, milking the thick shaft while the knot expanded further, sealing us together. Hot spurts of cum flooded my womb in thick ropes. I could feel every jet, the pressure building until my belly felt warm and full. He kept humping even while locked, short, grinding thrusts that dragged the knot against my g-spot and forced another orgasm out of me before the first had even faded.
We stayed like that for what felt like forever. His heavy body blanketed mine, panting hot against my neck. Every few seconds his cock twitched and another pulse of cum pumped into me. I was so full it leaked around the seal in thin rivulets that ran down my thighs. The knot pulsed with his heartbeat. I could feel it throb. My own heartbeat echoed in the stretched walls of my cunt. I reached back and stroked the place where we were joined, fingers sliding over the tight ring of flesh stretched around the base of him. The sensation made me whimper.
Eventually the urgency faded into something slower, deeper. He stopped thrusting and simply held me, locked and claiming. I rocked back against him in tiny movements, grinding the knot inside me, chasing smaller, rolling orgasms that left me shaking and soft. Time blurred. The only sounds were our breathing and the occasional soft whine from him when I clenched deliberately around the knot.
When the swelling finally began to ease, I felt the slow, wet slide of him starting to slip free. I clenched hard, trying to keep him, but gravity and the gradual softening won. The knot tugged at my entrance one last time and then popped free with a filthy, wet sound. A thick flood of mixed cum and my own juices poured out of me, soaking the carpet between my knees. I stayed in position, trembling, watching the white mess drip from my used cunt.
Rex stepped back, shook himself once, and then returned, nose pushing between my thighs again. He licked me clean with long, thorough strokes, gathering every drop. The roughness of his tongue against my oversensitive flesh made me jerk and moan. When he was satisfied he lay down beside me, heavy head resting on my hip.
I wasn’t finished.
I rolled onto my back, spread my legs wide, and reached for him. “Again,” I whispered. “I need it again.”
He didn’t need more encouragement. In seconds he was over me once more, this time face to face. His cock found my messy entrance easily and sank in with one smooth thrust. The second time the knot took longer to swell, letting him fuck me properly—deep, powerful strokes that rocked my whole body against the carpet. I wrapped my legs around his ribs and held on, nails digging into the thick fur of his shoulders. Every time the growing knot slammed against my entrance I begged for it. When it finally locked inside me again I came so hard my vision went white, cunt spasming around the thick bulb while he flooded me a second time.
We stayed locked longer than the first. I stroked his ears, kissed the side of his muzzle, whispered filthy praise while his cock twitched and pulsed inside me. When he finally slipped free I was a wreck—sweaty, trembling, thighs shiny with cum, belly slightly rounded from how much he had pumped into me.
I didn’t clean up. I didn’t get dressed. I simply curled against his warm side on the carpet, one hand resting on the heavy sheath between his hind legs, already thinking about morning.
Three days. We had three full days alone.
And I intended to spend every possible hour of them knotted and claimed.
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