eternaltriangle Whodunit plot element Literary threesome Complicated romantic relationship Ageless love conflict Romantic situation Relationship rife with conflict, often Literary trope involving three lovers Basis for some melodramas Affaires d'amour, sometimes Complicated love relationship Amorous entanglement Literary figure? Affaires d'amour, sometimes (15) Diaper? Two plus one, as always Constant problem with relating in ménage à trois Threesome in extremely adventurous liaison, primarily relating in complicated way