Here is as much as i could gather from my friend. Take this with a minor grain of salt because this an online friend of mine but she has leaked me correctly for Once upon a time, Scandal, and How to get away with Murder season finales as well as last years finale.

The scene is crosscut with Rhaegar and Lyannas wedding. The theme music plays in full over the scene. Jon initiates it. Dany is at first surprised but gives in. Hand holding, looking each other in the eye slow, romantic sex. She says like Robb/Talisa scene but no dialogue. Not much nudity. You can clearly tell the parallels between Jon/Dany and Rhaegar/Lyanna. She says Rhaegar is beautiful. Lots of moans and groans.You can tell they are in love. Thats all i have for now.

ADD: Jon is on top apparently.

ADD: she says most romantic scene in GOT history. lives up to the hype and surpasses Robb/talisa, greyworm/missendei, jon/ygritte scene. The way it is crosscut with lyanna and rhaegar is stunningly beautiful.

ADD: lol she thinks emilia and kit are couple.

ADD: Dany kisses jons scar about his heart and traces them with her fingers with tears in her eyes..fuck me.

ADD: Please take this with precaution. I never fully believe it until I see it for myself, but this is a reliable source.