With a loud cry of his own Mark came hard, his cum shooting deep inside of his big sister's pussy. Mark slowed down, each slow thrust ending with another squirt of sticky cum that felt so good going up inside of me. Mark moved his hands to the side and I lied down on my back. I could feel his heart pounding and he was breathing heavy into my ear. I reached my arm up and put it behind his head gently playing with his hair.

"Easy baby," I whispered. "Nice and easy."

I turned my head and kissed his cheek. Mark stayed lying on top of me for a...