It's heavily implied that Jamie is, especially in the book.
Decent episode, Danny was cringe as fuck as usual, when she pulled down that Baratheon banner and made a tough bitch face I laughed out loud.
If I were jon I would bang my step sis to secure her alliance or kill her off andhold littlefinger as a peaceful hostage to secure the knights of the vale til the war was over.
Dew it