Jolted awake

I'm having one of those dreams where I'm naked and nobody else is. I'm at work leading a meeting and I feel a cool breeze on my cock. I look down and realize that I'm naked. I look up and all the women in the room are smiling at me with a hungry look in their eyes.

I bring my hands up and rub my eyes thinking this must all be a dream. Just then one of the businesswomen tackles to me to the ground landing on top of me. I jolt awake and realize I am naked and some one is on top of me.

"Meg?"

"Shhhh...," she huskily whispers. Her hand wraps around my cock and I become aware of the heat of her pussy directly above the tip of my rod. Before I can really wake up enough to have much say in what's going on she sinks down engulfing most of my length into her hot depths. Meg is so hot and wet, she let's out a strange little moan of exhilaration before she's even bottomed me out. My eyes are beginning to make out Meg's form on top of me, something isn't right.

Before I can voice my confusion the rest of my cock is buried into the increasingly tight womanhood on top of me. "Oh God you feel great, I'm glad I came back for more."

That is not Meg, "Sam?!!" I cry out I protest.

She slams a hand down over my mouth and begins to thrust her hips up and down my length, "I told you I wanted more from you later," she let's out a moan of appreciation, "well, it's later."

My mind is reeling, the blowjob earlier was one thing, I mean I couldn't really stop that Meg was right there, but this is sex and I could stop this with no one except Sam getting angry. But... My hot little cock sleeve of a sister-in-law is riding me faster and faster. What to do...