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It's 1969, and everyone is enjoying the sexual revolution except for you. You're still a virgin, as your hippie step-sister makes you admit. She thinks it's embarrassingly square to still have your v-card at your age, and offers to help you lose it. You're tempted, but wouldn't that be a terribly taboo act that starts with the letter "I"? Your step-sister says the word casually, noticing that hearing it seems to turn you on. She teases you by saying the word over and over again as she shows you her tits, tempting you into that taboo act of family love. Before you know it, your own step-sister is stroking your virgin cock, sucking it, and then finally riding it until you both cum, repeating your favorite trigger word throughout.