Board Thread:Questions and Answers/@comment-202.80.217.27-20160620145143/@comment-26402117-20160629165647

Though she would definitely have resisted initially to uphold her duty to her fiancee Robert, there are several passages in the books that suggest that Rhaegar was both incredibly attractive (Cersei V AFfC monologue), and musically talented enough to make Lyanna "sniffle" (ASoS Bran II). That's the books though, the show has the liberty and the guts to either kill Bran and bury the truth - or to depart from the books in this regard.

It seems stupid to prophesy the three-headed dragon and make one a bastard though.