This brief moment from the 'Game of Thrones' Ep 5 trailer will be huge for Jon Snow

Warning: Contains fiery spoilers for Game of Thrones Season 7, Episode 5.

Now that Jon Snow and Daenerys Targaryen are developing what is quite clearly a burning lust for each other, there's one question that's more important than ever before: when are they going to find out they're both actually related?

Well, judging from the preview for next week's episode, it could be sooner than we think.

First, have a re-watch of the trailer. Pay particularly close attention to the bit 15 seconds in.

Okay, so we know that next week will be the first time Jon Snow comes properly face-to-face with one of Daenerys' scaly steeds. He's seen them from a distance before, but this will be his first up-close-and-personal encounter.

And, more importantly, it'll be the first time one of the dragons has seen him up close.

We know that Jon Snow has Targaryen blood running through his veins, so it would make sense for Drogon to recognise this in some way.

And if Drogon treats Jon differently, Daenerys is going to pick up on it.

Realistically, Jon Snow's true lineage probably won't be revealed for a little while yet, so here's how we see this playing out: Jon meets Drogon, and the two get on well. Daenerys realises something is up, and tries to encourage Jon to go for a dragon ride with her. After he's successfully mounted Rhaegal (the one named after his dad), two of the three heads of the dragon will be in place!

The Night's King is not going to know what's hit him.