"I'm cumming!" I yelled, thrusting my hips up and driving my hard cock into my sister's mouth. She pulled back, holding my cockhead in her mouth and working her tongue all around it, as she vigorously jacked her hand up and down my shaft. I didn't even try to hold back, as my balls tensed and I exploded into her warm mouth. She sucked and swallowed, as I jerkily deposited load after load of cum into her mouth. When I was completely spent, she let my cock plop from her mouth and looked toward the camera. Opening her mouth, she showed her husband her mouthful of cum and then smiled...