His jeans-clad knee slid between hers, parting her thighs.

His hands gripped her thighs, parting them, and his knees slid between hers.

His hands were at my waist and his knee slid between mine.

Her knees slid apart, her thighs forced wide by the downward pressure.

Effortlessly, his knee slid to part her legs, but when she threw him a look of utter dismay he paused.

His right knee slid forward and pressed a button just within the edge of the desk.

Gasping for air, I started hitching forward, elbows and knees sliding in the reeking mud.

He recoiled, and his knee slid on nylon.

Terrified, she tried to get up, but her knees slid in the blood and she fell forward across Andrea's chest.

His legs and knees slid painfully against the stone floor, the abrasions excruciating.