The office was empty except for the three of them. Lisa locked the door, kicked off her heels, and dropped to her knees in front of Mark's desk. "Pants down, boss," she said, already unzipping him. His cock sprang out half-hard. She wrapped her fingers around the shaft and gave it two quick strokes before sliding her wet mouth over the head.
Mia and Sarah watched from the couch, legs spread, skirts hiked up. Mia had two fingers buried in her own pussy, pumping slowly while she stared at Lisa's lips stretching around Mark's dick. "Suck it deeper," Mia ordered. "We got a bet on who can take him to the balls first."
Lisa didn't answer with words. She just opened her throat and pushed forward until her nose pressed against Mark's stomach. Spit ran down his balls and dripped onto the carpet. She held it there, gagging once, then pulled back with a wet gasp before slamming down again. Mark grabbed her hair and started fucking her face in short, hard thrusts.
Sarah stood up, peeled off her panties, and walked over. She knelt beside Lisa and started licking Mark's balls while Lisa worked the shaft. Their tongues met at the base of his cock every few strokes, swapping spit and pre-cum. "Tastes fucking good today," Sarah muttered, then sucked one heavy ball into her mouth and rolled it with her tongue.
Mark groaned and pulled Lisa off his cock. Strings of saliva connected her lips to his glistening head. "Mia, get over here," he said. "Your turn."
Mia crawled across the floor on all fours, tits hanging out of her unbuttoned blouse. She took him straight into her throat without any warmup, bobbing fast and noisy. Every time she pulled back, thick spit coated his entire length. Sarah leaned in and licked the mess off his balls again, then pushed two fingers into Mia's dripping cunt from behind.
Lisa stripped completely and sat on the edge of the desk, spreading her legs. She rubbed her clit while watching the show. "Fuck her throat harder," she told Mark. "She can take it."
Mark did. He held Mia's head with both hands and drove his cock in and out of her mouth like a piston. Her mascara ran down her cheeks. She gagged and choked but never pulled away. When he finally let her up for air, she gasped, wiped her mouth with the back of her hand, and grinned. "Told you I could take more than Lisa."
The three women switched places again. Sarah took the cock this time, but instead of deep-throating right away she licked long, slow stripes from base to tip, then slapped the head against her tongue. "You gonna cum down one of our throats or are we all getting fucked tonight?" she asked.
Mark answered by bending her over the desk and slamming into her pussy from behind. While he pounded her, Lisa and Mia knelt underneath, taking turns licking his balls and Sarah's clit. Every thrust made wet slapping sounds that echoed off the walls. Sarah came first, legs shaking, pussy clenching around his cock.
He pulled out and shoved back into Lisa's waiting mouth. She sucked him clean of Sarah's juices, then let Mia have a turn. They kept trading until Mark's breathing turned ragged.
"Open your mouths," he ordered.
All three girls knelt in a row, tongues out. He stroked his cock twice and shot thick ropes across their faces and tongues. Lisa caught most of it, swallowing loudly. Mia licked what landed on Sarah's cheek and fed it to her with her tongue. They kept kissing and swapping cum until nothing was left on their skin.
Mark sank into his chair, cock still twitching.

"Meeting's over," he said. "Same time tomorrow."
The girls stood up, wiped their chins, and started fixing their clothes. Lisa grabbed her purse and smirked. "Don't forget the client presentation at ten. And tell the new guy he starts Monday. We need fresh meat."
They left laughing, already planning who would suck him first.