Maisie Williams and Sophie Turner may be the one Game of Thrones alliance that’s built to last.

The enduring friendship between the pair of actors who play sisters on the epic HBO show has been a real treat for Thrones fans. They even have those Maisie Williams and Sophie Turner tattoos, endearingly practiced their autographs together, and swap loving tweets to each other.

And apparently, the rapport was instant.

It all began with the chemistry read where 12-year-old Maisie Williams and 13-year-old Sophie Turner meshed very well.

“We were pretty much best friends from that second on,” Turner told Rolling Stone in a cover story published Tuesday.

Williams was all praise for her offscreen soul sister too.