Lena slammed the ancient book shut, her breath ragged. The summoning circle on her apartment floor glowed red, and there he stood: a towering demon with obsidian skin, horns curling back, and a cock that hung heavy and thick between his legs, already twitching to life. "Fuck," she muttered, stripping off her tank top. Her tits bounced free, nipples hard. "I didn't think it would actually work, but goddamn, look at that monster."
The demon growled, voice like gravel. "You called me for this, mortal? Then get on your knees and worship it." Lena dropped without hesitation, wrapping both hands around his shaft. It was hot, veined, and ridged like nothing human. She licked the head, tasting salt and smoke, then forced her mouth over it. Her lips stretched wide as she sucked, spit dripping down his balls while she jerked the base. "That's it, choke on demon cock," he snarled, thrusting deeper until her throat bulged.
She gagged but didn't stop, one hand sliding between her legs to rub her soaked pussy. Fingers plunged in as she bobbed faster, moaning around the thick meat filling her mouth. The demon grabbed her hair and fucked her face, balls slapping her chin. When he pulled out, strings of saliva connected her lips to his cock. "On the bed. Now."
Lena scrambled onto all fours, ass up. He didn't waste time. The head of that huge cock pressed against her entrance, stretching her pussy lips wide as he pushed in. She cried out, the burn mixing with pleasure. Inch after inch sank into her, filling her deeper than any guy ever had. Her walls clenched around the ridges, juices running down her thighs. "Fuck yes, wreck my cunt with that demon dick," she gasped, pushing back to take more.
He gripped her hips and slammed home, the full length buried inside her. Lena's eyes rolled as he started pounding, each thrust making her tits swing and the bed creak. Her pussy squelched wetly around him, cream coating his shaft. She reached back to spread her ass cheeks, begging for it harder. The demon obliged, hammering her until her vision blurred. Orgasm hit fast—she screamed, squirting around his cock, body shaking.
He flipped her onto her back without pulling out, legs pushed to her chest. Now she could see it: that thick, dark cock disappearing into her stretched hole with every brutal thrust. Her clit throbbed; she rubbed it furiously while he fucked her senseless. "Take it all, you filthy slut," he grunted, sweat and precum mixing. Lena came again, pussy pulsing, milking him. He roared and unloaded, hot thick cum flooding her womb, overflowing and leaking out around his still-pumping shaft.
They didn't stop.

She climbed on top next, sinking down onto that cum-slick demon cock, riding him reverse cowgirl so he could watch her ass bounce. Her hands braced on his thighs as she slammed down again and again, feeling every ridge drag against her G-spot. "God, this cock is ruining me," she moaned, reaching down to stroke the base while her pussy swallowed it. He smacked her ass hard, leaving red prints, then grabbed her waist and thrust up to meet her. Cum and her juices frothed at the join, dripping everywhere.
Lena leaned forward, changing the angle so he hit even deeper. Her second wind hit; she fucked herself on him faster, tits bouncing wildly. The demon's claws grazed her skin just enough to sting, heightening everything. She came a third time, whole body locking up, then collapsed forward only for him to roll her under him again. This time he took her slow and deep, grinding his pelvis against her clit with each roll of his hips. "You wanted demon cock? You're getting it all night."
By the fourth round she was a mess—hair tangled, lips swollen, pussy red and puffy but still greedy. She lay on her side, one leg hooked over his arm as he spooned behind her and slid back inside. The angle let him go balls-deep while his hand reached around to pinch her nipples. "Tell me how it feels," he demanded. "Feels like heaven and hell at once," she panted. "Don't stop fucking me."
He didn't. They moved together in that raw rhythm until he filled her again, cum pumping in thick spurts. Lena milked every drop, clenching around him. When he finally pulled out, a river of mixed fluids poured from her well-used hole. She reached down, scooped some up, and licked her fingers clean while he watched.
Exhausted but glowing, she curled against his chest. "Same time tomorrow?" The demon's laugh rumbled through her. "Summon me whenever that greedy cunt needs more." Lena smiled, already planning the next circle. Her body ached in the best way, marked and satisfied by the demon cock she'd craved.