You are correct! They are sisters in real life.

Honestly, if they just had the one fling I wouldn't care (Bjorn and Astrid), but the ongoing affair seems weird. If you're right, Astrid kills her because of something related to Bjorn…I will be bummed. Lagertha has been one of my favorite female characters on TV for a while now, so I want Lagertha to go out like a…

Astrid was like Lagertha & Ragnar groupie who happened to be hot, so Lagertha took her under her wing with benefits. Of course, Astrid would not say no to any piece of the Lagertha/Ragnar lineage i.e. Bjorn. As for their relationship, it isn't that big of a deal - the show has displayed many times the open sexuality…