Their union is viewed as a betrayal of their own bloodline.

+-----------------------------------+ | External Obstacle / Prohibition | +-----------------------------------+ | v +-----------------------------------+ | Heightened Dopamine & | | Anticipation (Romeo & | | Juliet Effect) | +-----------------------------------+ | v +-----------------------------------+-----------------------------------+ | | v v +-----------------------------------+ +-----------------------------------+ | Deepened Emotional Intimacy & | | Catharsis: Safe exploration of | | "Us Against the World" Mentality | | societal boundaries & rebellion | +-----------------------------------+ +-----------------------------------+ The Dopamine of Anticipation

The socioeconomic friction found in The Notebook or classical period dramas. Power Imbalances and Professional Boundaries