Also, please make sure you do not let this erode your self-confidence and self-esteem. It is not that these ladies are in any way funnier, warmer, more attractive, or "better" than you are, in any way. They are damsels in distress, the particular kind of their distress (of sexual nature and/or "dark" nature) makes them very appealing, the twistedness of the situation (the little sister confided in him saying that she has feeling for him) etc. makes them yet more appealing, and the forbidden fruit element involved in all of that ups their appeal factor yet further.