Dean-Charles Chapman and Nell Tiger Free, who play King Tommen and Myrcella Baratheon, may be dating. (HBO)

It's a Lannister love connection!

Game of Thrones co-stars Dean-Charles Chapman, 17, and Nell Tiger Free, 15, who play King Tommen and Myrcella Baratheon, appear to have made a real-life love connection. While they are no longer working together (at least for now), the actors, whose characters are siblings, are spending a lot of time together.

View photos This selfie of them was posted yesterday. (Instagram) More

Hat tip to BuzzFeed for first linking the pair, who snapped a selfie yesterday in what appeared to be a hotel room. The day before, they documented a flight they were on together. This followed a camping trip they took with their GoT co-star Isaac Hempstead Wright, who plays Bran.

These aren't the only signs. She's also called him "my boy" (even though she went on to say he looked like a serial killer), referred to him as whipped, gushed that he "loves" her, and they both tweeted about missing each other.

Their co-star Maisie Williams, who plays scrappy Arya Stark, even acknowledged the relationship gossip:

BANTS IS UNREAL RN. SO MUCH BANTS. INCEST BANTS. BANTS. bants. https://t.co/fhiXArz0sD — Maisie Williams (@Maisie_Williams) August 20, 2015

Though, if she's for it or against it, we're not sure.

And when the story started blowing up, Nell didn't deny it, tweeting instead just two words:

Oh my — free nell free (@nelltigerfree) August 21, 2015

There's always something funny about reel life siblings dating — like when Dexter's Michael C. Hall and Jennifer Carpenter ran off and got married (well, briefly) – but in this case it is especially so because because Nell and D-C's parents on the show, Jaime and Cersei, are — gulp — brother and sister.

Thankfully these two cute young co-stars don't share any real-life bloodlines and can carry on with this sweet little lovefest —or whatever it is.