4, pain now for pleasure later

Wishing for his son to have a child, the father was not expecting his wife who was made infertile in a chemical accident to create a miracle child. That daughter quickly grew up and during her childhood, she and her brother grew closer and were even caught being inappropriate with one another and also being left alone while they fucked. Eventually, it was thought that the son was infertile, somewhat to the delight of his parents, yet the fact remained, if the son was infertile, how could he create a child? It was then that the father found out part of the plan as his daughter walked in, seducing her father who remained faithful and informed their mother. But it was also revealed that a tragic event was unfolding, the mother was dying and with it, she thought she might as well allow her daughter to embrace her father and fill their void. Thus began a three-way relationship which continued when the mother was getting better and their family life was becoming richer until it was revealed that the father had impregnated the daughter. This was when the son finally broke and ran away from home, accidentally being united with his niece who his father and sister had conceived, getting married while already pregnant and meeting her parents. It was then that the wish was fulfilled and everyone got what they wanted, love, passion, sin and excitement.