"Game of Thrones" Watch cast react to Dany and Jon's sex scene in season 7 finale

Dany, Jon Snow, Bran and Tyrion share their thoughts on that inevitable sex scene in "Game of Thrones" season 7 finale.

The incest sex "Game of Thrones" fans desperately wanted finally happened in the seventh season finale.

Daenerys Targaryen and Jon Snow finally consummated their attraction while on a boat sailing to the North.

Tyrion, who was standing outside the door, had a concerned look on his face when he realized what was happening.

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Jon Snow and Dany in Game of Thrones season 7 

(HBO)

In a behind-the-scenes video, Kit Harington (Jon Snow), Emilia Clarke (Daenerys Targaryen), Isaac Hempstead Wright (Bran Stark) and Peter Dinklage (Tyrion Lannister)  talk about that inevitable sex scene.

They also discuss what this means for the two who are actually related by blood but are yet to find out.

Kit Harington (Jon Snow)

"I think it's an inevitability from about halfway the season that Jon Snow and Daenerys are going to fall into bed together.

"I think they both know it's wrong, I think they both know it's gonna cause problems, but it's that thing when you suddenly feel that deeply about someone.

"It's like a runaway train, you can't stop it from happening."

playJon and Dany in "Game of Thrones" season 7 episode 6 (HBO)

Emilia Clarke (Daenerys Targaryen)

"And for us as actors, it's just weird. The reality of what they are to each other? I don't know how that's gonna... I mean, It's kind of (mimics retching) might be the reaction."

playJon and Dany (HBO)

Peter Dinklage (Tyrion Lannister)

"It's dangerous, for everybody involved. I'm sure it's good for the both of them, in the moment. But, you don't even get the relief of how beautiful it could or should be.

"It's "Game of Thrones," there's a long history of romance not ending well on this show."

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Jon and Dany 

(HBO)

In the finale, in one of Bran Stark’s visions, it is revealed that Rhaegar and Lyanna were legitimately married after the Targaryen’s marriage to Elia Martell was annulled. This makes Jon Snow the legitimate heir to the Iron Throne.

In Inside the Episode video on HBO YouTube page, showrunners David Benioff and Dan Weiss said Jon Snow being a Targaryen complicates everything.

Viewers would have to wait until 2018 or 2019 to find out how complicated this thing between Jon and Dany is.