Experimental Knot Part 3

Dr. Elena Voss' experimental vasodilator pills was swallowed by her Doberman. Part 3

Elena lay there for a long minute, chest heaving, every muscle trembling from the marathon of orgasms. Cum still leaked steadily from her gaping pussy and ass, thick white trails cooling on her thighs. Rex panted beside her, tongue lolling, his red cock finally starting to soften at the tip but still mostly rigid, knot half-deflated yet twitching with residual drug-fueled life. The vasodilator's grip was loosening, but not fast enough for her liking. She wanted control now, wanted to wring every last drop out of him before the high faded completely.

She sat up slowly, legs shaky, and grabbed the leather leash from the nightstand. "Come here, big boy. Time to make this easy." She coaxed Rex onto his back again, this time looping the leash around one of the sturdy wooden bedposts at the headboard. She tied it short, securing his collar so he couldn't roll away or lunge too far. His paws flailed a bit in confusion, but he stayed put, cock jutting up vulnerably, still glistening with her juices and his own cum.

Elena straddled him reverse now, facing his head so she could watch his reactions. She grabbed the base of his shaft, slick and hot, and sank down in one smooth motion. Her pussy swallowed him easily after all the stretching, walls fluttering around the familiar girth. "Fuck yes, that's my good stud. Mama's gonna ride this dog dick until you give me everything left in those heavy balls."

She rolled her hips in slow, grinding circles at first, clit dragging against his sheath fur with every rotation. Her full tits bounced heavily as she picked up speed, hands braced on his chest for leverage. "Look at you, tied up like my personal fuck toy. Nine inches of perfect red meat just for my greedy cunt. You love filling me, don't you? Love pumping all that thick cum deep where it belongs."

Dirty words spilled out faster, voice husky and wrecked. "God, your knot feels so good bumping my cervix. Stretch me wider, boy. Make my pussy gape for days." She lifted almost off him, then slammed back down, ass cheeks clapping against his hips. Sweat slicked her skin, tits jiggling wildly. She pinched her own nipples hard, twisting until pain sparked fresh heat in her core. "Cum for me soon, Rex. I want to feel you throb and flood my throat next."

After a few minutes of brutal riding, she pulled off abruptly, pussy clenching on nothing, dripping strings of mixed fluids onto his belly. She scooted down between his spread hind legs, mouth watering at the sight of his cock bobbing, still rock-hard but starting to leak less precum. The drug was definitely wearing off now; his endurance was cracking.

She wrapped her lips around the pointed tip and sucked hard, tongue swirling the underside. "Mmm, taste us together, boy. All that cum you pumped into my holes mixed with my pussy juice. So fucking filthy." She bobbed deep, throat opening easily after earlier abuse, nose pressing into his sheath. One hand cupped his heavy balls, rolling them gently while she hollowed her cheeks.

Rex whined, hips twitching against the restraint. In under five minutes his body tensed. Elena felt the first powerful spurt hit the back of her throat, thick and hot. She swallowed greedily, moaning around his shaft as rope after rope flooded her mouth. "Yes! Give it to me, stud. Cum down mama's throat like the good breeding dog you are." She milked him with her lips and tongue until he shuddered through the last weak pulses, finally spent in her mouth. She pulled off slowly, letting the last dribble coat her tongue before swallowing with an exaggerated gulp.

His cock softened noticeably now, knot shrinking fast, red length retreating toward the sheath. But Elena wasn't ready to end it. A wicked idea sparked, one she'd used on an ex years ago. That guy had gone rock-hard again after she rimmed him, begging for round two. If it worked on a man, why not on her beast?

She leaned lower, tongue flicking out to lap at his heavy balls, salty and musky. "These big balls worked so hard for me tonight. Time to worship them properly." She sucked one into her mouth, rolling it gently with her tongue, then the other, humming vibrations through the sensitive skin. Her hand wrapped around his softening shaft, stroking slowly from base to tip, coaxing life back into it.

Rex panted harder, tail thumping weakly against the mattress. She felt him twitch in her palm, thickening again under the dual assault. Emboldened, she pushed his hind legs wider with her free hand. Her tongue traced lower, past the base of his balls, until it circled the tight pucker of his ass. The taste was raw, earthy, animal. Filthy thoughts flooded her mind: this is so wrong, so depraved, licking my dog's asshole like a desperate slut. And fuck, I love it.

She pressed her tongue flat against the ring, then pointed it, pushing inside slowly. Rex yelped in surprise, then settled into low, rumbling growls of pleasure, hips bucking slightly. "That's it, boy. Feel mama's tongue in your tight little ass. You love being rimmed, don't you? Makes that cock wake right back up."

She worked her tongue deeper, in and out, while her hand stroked his shaft faster now, slick with leftover cum and spit. His cock hardened fully in her grip, knot swelling again at the base. The combination drove him wild; he whined and thrust into her fist, ass clenching around her invading tongue.

In less than three minutes he tensed again. Thick spurts erupted from his tip, splattering her cheek, chin, and tits in hot ropes. Elena kept stroking through it, milking every drop while her tongue stayed buried, feeling his hole pulse rhythmically. "Cum for me again, you filthy stud. Cover your mama in it."

When the last spurt faded, his cock finally shrank completely, slipping back into the sheath, knot gone for good. Rex lay there panting, eyes half-lidded, completely drained.

Elena sat back on her heels, face and chest streaked with cum, body aching in the best way. She wiped a glob from her nipple and sucked it off her finger, smiling lazily. "Good boy. All better now. But don't think this is the last time, Rex. Next time mommy brings home more samples... we're going even longer."

She untied the leash, curled up beside him, one hand resting possessively on his sheath as they both drifted toward exhausted sleep.