When their mother remarried, two sisters moved in with their stepfather, and a deep throating tragedy befell them. The penis inserted into the older sister's vagina goes straight into the younger sister's throat, and then from the younger sister's vagina to the older sister's throat in a PtoM incest scene. The two are trained to have their throats drilled at the same time, and are subjected to continuous, insane deep throating. What will become of these women who are forced to perform nonstop sexual services every day as slaves?