There was a strange sound accompanying the vibration, a kind of shuffle or hiss that repeated itself in a pattern. Then it stopped. John shifted, and his breath was different. He wasn’t sleeping anymore. The vibration started again, the mattress shaking a little more, and I heard John whisper something, his breath coming faster. My eyes widened and I felt a jolt of excitement run straight down my spine and right between my legs. John was masturbating!

I listened to the sound of his hand on his cock, the motion of the bed rocking me slightly. Did I sleep through this every night, I wondered? Listening to him made me wet.

He would stop for a moment, breathing hard, and then start again. I wondered what he was imagining. Once in a while I heard him whisper something and I strained to hear him.

“Yeah, spread your pussy,” I heard him say. “Good girl.” I bit my lip, squeezing my legs together. My clit throbbed, and I wanted to touch myself, but I didn’t want to let him know I was awake. My hand was curled near my breast as I lay on my side, and I touched my nipple, grazing it lightly as I listened to him.

He pumped his cock hard now, the whole bed bouncing with his movements. He clearly wasn’t worried that I might wake up-as I obviously never had before.

“Suck it,” he whispered. “Take that cock, you dirty little whore.” My face flushed and my clit throbbed in response to his words. Oh my God, John was imagining having his cock sucked by a dirty little whore! He had never said those words to me. I wondered if it was me he was thinking about, or if it was some woman he had seen, someone at work, some girl behind the counter who had caught his eye for a moment? Maybe the phone sex operator? The thought was darkly exciting.