Part 3 - Sister's Dilemma  It was early evening and David Cashmore lay on his back on his mother’s queen-sized bed. His mother, still fully clothed, straddled his naked body.  She was performing fellatio on her son, slowly sliding her tongue along his shaft and then lapping at his pink glans, sucking the drops of pre-seminal fluid as they seeped from the eye of his cock. She was in no hurry to bring her son to orgasm and...