Queencest
Sexual relations between two sisters who are both married kings, thus are queens. If an heir to the queencestuous throne is desired, one queen may become impregnated by their mutual brother
Queen Jil of Winterfelll: “Hey sis, wus good?”
Queen Jenny of Casterly Rock: “NMU? Let’s have some Queencest”
Queen Jenny of Casterly Rock: “NMU? Let’s have some Queencest”