After-Hours Form Check

I couldn’t stop staring at her ass. Every time Lena bent forward on the yoga mat, those tight black leggings stretched across the firmest, roundest cheeks I’d ever trained. My cock twitched against my shorts before I could even lock the office door behind us.

The building had emptied an hour ago. Only the low hum of the air conditioner and the faint city glow through half-shut blinds remained. Lena straightened, cheeks flushed, ponytail swinging. She was twenty-six, a marketing exec who booked late sessions because her days were packed. Tonight she’d asked for “extra glute work.” I knew what that really meant. The way her eyes kept flicking to the growing bulge in my shorts told me she did too.

“Mark… you’re staring again,” she said, voice low and teasing. She planted her hands on her hips, pushing that perfect ass out just a fraction. “Is my form that bad?”

I stepped closer, heart hammering. The scent of her coconut lotion mixed with clean sweat. “Your form’s fucking perfect, Lena. That’s the problem.”

She bit her lip, eyes darkening. Without another word she turned, dropped to all fours on the mat, and arched her back. The thin fabric clung to every curve, outlining the cleft between those tight cheeks. My hands moved before my brain caught up, palms sliding over the firm globes, squeezing. God, they were rock-hard from all the squats, yet still soft enough to spill between my fingers.

“Like that?” she whispered, pushing back into my grip. Her voice shook with need.

“Yeah… just like that.” I hooked my thumbs into the waistband and peeled the leggings down slowly, inch by inch, until her bare ass glowed under the emergency lights. No panties. She’d planned this. The smooth skin was slightly damp, warm, and impossibly firm. I gave one cheek a light slap; it barely jiggled, the muscle so toned it bounced right back.

Lena moaned, dropping her chest lower so her ass lifted higher. “Don’t tease, Mark. I’ve been wet since the second set of hip thrusts.”

I freed my cock, thick and heavy, veins pulsing. The head brushed the cleft of her ass as I leaned over her. She shivered. I rubbed the length along her slit from behind, coating myself in her slickness, letting the fat head nudge her clit with every slow pass. Her breath hitched each time.

“Put it in,” she begged, voice cracking. “I need you stretching me while you grip my ass.”

I pressed forward. Her pussy was tight, almost resistant, but she was so wet the head popped inside with a wet sound. Lena gasped, fingers curling into the mat. I sank deeper, feeling her walls flutter around every inch until my hips met those firm cheeks. The contrast—her hard-trained muscle pressed flush against my pelvis—made me groan.

“Fuck, it’s so deep like this,” she panted. “Hold my ass… harder.”

I dug my fingers into the toned flesh, using the grip to pull her back onto me. We found a rhythm: slow, deliberate strokes that let me watch her pussy swallow my cock while her ass flexed and relaxed with every thrust. The office echoed with the soft slap of skin, her muffled moans, the wet sounds of us fucking.

I changed the angle, pushing her hips down so she was almost flat on the mat, legs together. My dick slid even tighter between her thighs and into her cunt. The position made her ass look even rounder, two perfect hemispheres I could knead while I drove into her. Lena turned her head, cheek against the cool floor, eyes glassy.

“Faster… please, Mark. I’m so close already.”

I gave her what she wanted, hips snapping harder. Her firm ass rippled under my palms with each impact. She reached back, spreading herself wider so I could watch my cock disappear between those cheeks and into her dripping pussy. The sight pushed me right to the edge.

Her walls suddenly clamped down, pulsing in strong waves. “I’m coming… oh god, don’t stop gripping me—” Her voice broke into a long, shuddering moan. I felt her squirt a little, warmth flooding around my shaft.

I kept thrusting through her orgasm, chasing my own. Just as my balls tightened, I pulled out, aiming at that beautiful, firm ass. Thick ropes of cum painted across both cheeks, dripping down the cleft. Lena whimpered at the heat, pushing her ass up to catch every drop.

We stayed like that, breathing hard, my hands still on her cum-streaked skin. She glanced over her shoulder with a wicked little smile.

“Next session… we’re doing this again. But slower. I want to feel every inch while you worship this ass.”

I squeezed the firm flesh once more, already getting hard again.