Sarah hit the gym every Tuesday like clockwork, her tight yoga pants hugging the curves she'd earned after two kids. At 42, she still turned heads, but her husband barely noticed anymore. That afternoon the place was quiet except for one guy on the squat rack. He was massive, dark skin gleaming with sweat, arms like tree trunks, and when he turned she couldn't miss the thick outline down his left thigh.
She tried to focus on her treadmill but kept glancing over. He caught her staring and smirked. "Need a spot?" he asked, voice deep and rough.
Before she knew it they were talking. His name was Marcus. He was 28, personal trainer, and when he brushed past her to adjust the weights his hand lingered on her hip. Sarah felt her pussy clench right there. She hadn't been fucked properly in years.
Marcus leaned in close. "You keep looking at my cock like that, I'm gonna think you want it."
Her face burned but she didn't deny it. "Maybe I do," she whispered.
He grabbed her wrist and led her straight to the men's locker room. It was empty. He locked the door, shoved her against the lockers, and yanked her pants down. Her ass was bare, already wet. Marcus pulled out his dick and Sarah gasped. It was huge, thick, veiny, and black as night, already rock hard and leaking.
"Get on your knees and suck it, mom," he ordered.
She dropped fast, wrapping both hands around the shaft and licking the head. It tasted salty and hot. She forced her mouth open wide, taking as much as she could while he gripped her hair and fucked her throat. Spit ran down her chin onto her sports bra.
Marcus pulled her up, bent her over the bench, and slammed into her pussy in one thrust. Sarah moaned loud, the stretch burning so good. His black cock filled her deeper than anything ever had, pounding her cervix with every stroke. Her tits swung free as he ripped her top off and grabbed them hard.
"Fuck, your married white pussy is tight," he growled, slapping her ass. "Gonna stretch it out."
She pushed back against him, begging for more. "Harder. Fuck me like my husband can't."
He flipped her onto her back on the bench, legs over his shoulders, and drilled her deep. The wet sounds of his cock slamming her soaked cunt filled the room.

Sarah came hard, squirting around his shaft, but Marcus didn't stop. He kept pounding, calling her a dirty gym slut, a cheating mom who needed black dick.
He pulled out and shoved it back in her mouth so she could taste herself. Then he bent her over again, this time aiming lower. "Ever had a cock in your ass?" he asked.
She shook her head but didn't stop him. He worked spit on her hole and pushed the thick head in slow. The burn mixed with pleasure until he was balls deep in her ass, fucking it raw. Sarah fingered her clit and came again, shaking.
Marcus grunted, pulled out, and painted her face and tits with thick ropes of cum. She licked what she could reach, swallowing every drop.
They cleaned up quick but exchanged numbers. Sarah left the gym with his load still drying on her skin and a promise to meet again the next day. Her husband would never know, but she was already addicted to that big black cock.