As my pussy contracted around it, my brother's cock suddenly exploded, sending a river of hot cum deep up inside of me. I groaned and squealed as I bucked my hips and my legs threatened to give. All the while my brother continued to paint the inside of his sister's pussy with an enormous amount of cum. With a long shuddering moan Mark emptied the last of his cum into me and pulled out to lean against the shower wall.

With an effort I stood straight up and also leaned against the wall. Mark shut the water off and, stepping out, wrapped himself in a towel, then held one out...