From Wife Watching:

 

"Call me a slut."

 

His fingers stalled inside her pussy, like the request surprised the action right out of him. "Are you a slut?"

 

"Yes," she hissed, tossing her head back. Her pink nipples pointed straight at the ceiling. Simon wished to hell Arthur would lean down and catch them between his teeth. Bite her breasts. Tease her. Hurt her.

 

She liked that.

 

"Slut," Suki said, drawing out the S. She licked her fingertips and sent them to her clit. "Arthur, honey, I'm such a fucking slut."

 

"Yeah?" His fingers moved faster in her pussy.

 

"Yeah, baby." She gasped for breath as she toyed with her clit. "Oh fuck, that's good."

 

"And that's just fingers." Arthur chuckled. "Wait until I get my fat dick inside you, slut."

 

Simon's cock strained against his zipper. He wouldn't be surprised if his erection broke through his pants.