A step-Mothers Taboo Prophecy

step-Mother has great news and asks to meet within your chambers. Once alone she tells you she has great news from seeing the seer earlier today. She confesses their is a prophecy of gods devoted love which she herself is and as this devoted love of god she holds within her magic, a magic she can gift to her step-son through her womb. Together you both shall birth an all powerful demigod and until that day you shall hold a remarkable power to rid your lands of all enemies and bring peace to the entire realm. You must plant life within your step-mothers womb, it is as god wishes. Your step-mother is thrilled and feels blessed and her eagerness and willingness to have you cum inside her is to great to resist.