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This is because there's nothing stopping the intro line triggering a second time if she is left alone for too long before you get her to deepthroat for the first time.  A lot of more recent story-based dialogues (basically everything after I joined) have a variable that's checked before the intro is played and set after it finishes for the first time (so it plays once, then sets a variable to tell it not to play again). For the moment, just don't leave her alone until she starts saying general lines instead of intro.