Chad was grunting, and he could hear the smack of skin on skin.

Mike's cock was already growing hard, while he listened to it. He stood in the hallway, looking up at the open door to the bedroom. There were shadows moving on the wall opposite the door, dark shapes that hinted at limbs and bodies thrusting. He stared at them and started to move down the hall.

When the floor squeaked loudly under his feet he stopped dead and waited. Neither of them seemed to notice anything. The sound of their sex never faltered for a moment. Lori's moans were deep and guttural. Chad's breathing was very loud and harsh.

When he was only a couple of feet away from the bedroom door, their legs came into view. Chad's legs, splayed out wide on his bed. Moving back and forth. One of Lori's legs was stretched out under his, spread even wider. Her calf was pointing up at the ceiling, her toes curled tightly. He moved forward a tiny bit more until he could see a thigh, spread out wide underneath Chad's thrusting ass. Her skin jiggled with the force of his body ramming against hers.

Mike stood quietly, watching them. Every time Chad pulled back to thrust again, he could see the shaft of his cock, the head still buried inside of Lori. It glistened wetly.

Mike's own cock was rock hard, bulging from his work pants. He stroked it absently through the fabric while he watched Chad fucking his wife, hard and fast and deep.

Lori's moans hitched and she gasped.

"Cumming," she squeaked. "I'm cumming. Harder. Ah!"

Chad bore down on her, his ass pumping faster. Mike moved forward even more. Chad was pushed up on his elbows, looking down at her. Her breasts heaved back and forth, and her hands were dug into his shoulders like claws.

"Oh god," she cried out. "Ah! Oh god! Uh!"

She wrapped her legs suddenly around his ass and squeezed him hard against her, and shuddered underneath him.

"Oh my god," she breathed. "Oh my god, so good..."

Chad leaned in to kiss her. Mike could hear the wet smack of their lips together. Then he pushed himself suddenly up, rearing up above her, so that Mike could see him entirely. His blond hair was mussed up, and his face was red and had a sheen of sweat on it.

"Turn over,' he said, but at that moment he caught sight of Mike standing in the hallway, watching silently.

"Oh fuck!" he yelped, and scrambled up from the bed.

"What?" said Lori. "What is it?"

She sat up in bed and looked over at the door, her eyes meeting Mike's. They stared at each other for a moment.

Then she flopped back onto the bed again.

"Oh," she said. "You couldn't stay away, I guess."