She dropped to her knees the second he told her to. No hesitation, no smart mouth this time. The concrete floor was cold against her bare skin, but she stayed still while he circled her, boots scraping loud in the quiet room.
"Hands behind your back," he said. His voice was flat, the way it always got when he meant business. She laced her fingers together and he wrapped the leather cuffs tight, buckling them so her elbows pulled back and her tits pushed out. The position already made her shoulders burn, but that was the point.
He grabbed a fistful of her hair and yanked her head up so she had to look at him. "You remember the rules?"
"Yes, Sir."
"Good. Mouth open."
She opened. He unzipped, pulled his cock out, already half-hard, and shoved it between her lips without any warm-up. She gagged when it hit the back of her throat, spit running down her chin fast. He didn't ease off. He fucked her face in short, rough thrusts, holding her head with both hands so she couldn't pull away. Every time she choked he pushed deeper, using her throat like it was just another hole.
When he pulled out she was gasping, strings of spit connecting her mouth to his cock.

He wiped the mess across her cheek with the head of his dick.
"Up."
He hauled her to her feet by the cuffs and marched her to the padded bench. She knew what was coming. He bent her over it, kicked her feet apart, and strapped her ankles to the legs so she was spread wide. Her ass was up, cunt exposed and already wet. He ran two fingers through her folds, not gentle.
"Fucking soaked," he muttered. "You like being used like a cheap slut, don't you?"
"Yes, Sir."
He slapped her ass hard, then again on the other cheek, leaving red handprints. Then he grabbed the flogger. The first few strikes were light, just warming her up, but he built fast. Soon the leather was cracking across her ass and thighs in steady rhythm. She jerked and moaned, cunt clenching around nothing every time the tails bit into skin. He didn't stop until her ass was striped and hot.
He dropped the flogger and stepped between her spread legs. She heard the tear of a condom wrapper, then the blunt head of his cock pressing against her. He didn't tease. He drove in all the way on the first thrust, bottoming out so hard her hips slammed into the bench. She cried out. He started fucking her immediately, deep and brutal, one hand gripping the cuffs for leverage.
Every stroke knocked the air out of her. His balls slapped her clit on every thrust. He reached under her and pinched her nipple, twisting until she yelped, then did the other one. He kept pounding, changing angles so the head of his cock dragged over that spot inside her that made her legs shake.
"Don't come yet," he warned. "You come when I say."
She tried to hold it back, but he was relentless. He pulled out, spat on her asshole, and pushed two fingers in without warning. She gasped at the stretch. He worked them in and out while he went back to fucking her cunt, now using both holes. When he added a third finger she started babbling.
"Please, Sir, please let me come."
He laughed once, low and mean. "Not yet."
He pulled everything out, unbuckled her ankles, and flipped her onto her back on the bench. Her cuffed wrists were trapped under her. He pushed her knees to her chest and sank back into her cunt, folding her in half. The new angle was even deeper. He fucked her like he was trying to split her open, sweat dripping off him onto her stomach.
When he finally reached down and rubbed her clit in tight circles she came hard, cunt pulsing around his cock, thighs trembling. He didn't stop. He fucked her straight through it until she was oversensitive and whining. Only then did he pull out, rip the condom off, and stroke himself over her face. Thick ropes of come landed on her tongue, her cheeks, her tits. He wiped the head across her lips so she could lick it clean.
He left her there a minute, breathing hard, come cooling on her skin. Then he unlocked the cuffs, helped her sit up, and handed her water. She drank while he wiped her face with a warm cloth, quiet now.
"Color?" he asked.
"Green, Sir. Really fucking green."
He nodded, pulled her against his chest, and held her until her breathing evened out. Outside the room the world kept turning, but in here there was only the raw, dirty truth of what they both needed and the way they gave it to each other without apology.