If it turns out Lyanna & Elia knew about each other & accepted each other, that would not surprise me at all. GRRM has made numerous instory mentions & real world comments of his fondness for plural/open marriage and “gatherings” #DyingoftheLight Learn somthin’ ya fools
Germ also once spoke against the idea of it being considered unfaithful and cheating if you got sex from someone else you knew. He compared it to going to X’s house and having dinner and then maybe a little sex. (Still researching for that quote) Aah,the 60’s #Martinworld
FOUND IT! Per usual, looking for something else and found the GRRM quote... on my own page 
Sex as open and casual as dinner with a friend
#Martinworld #EliaknewaboutLyanna

Sex as open and casual as dinner with a friend
#Martinworld #EliaknewaboutLyanna
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