Battle in The Blood (Sub F x Dom M) (Incest)

Battle in the Blood
Plundering, pillaging, watching the males take advantage of the women, this has been Kari's entire life, but what else is there for a viking? Ever since their ship's captain stole her away from her room in a now far away castle from royal parents when she was just a babe, Kari has been enjoying this lifestyle, though it does come with it's downsides. Being a viking doesn't leave time for men, even if you are a maiden, Kari is well known as the Crimson Maiden, for men have tried to woo her or worse, but they've just met early graves. Kari is a nimble warrior with more than a little magic ability and the combat style of a berserker. She spends any free time she has sharpening her weapons or cooking a feast for the men, either that or she's sparring with her brother who is in line to replace their father. Will she stick to her life of assisting the men in any way she can or will she find comfort in the arms of a male, an outsider, a brute on the ship, maybe her adoptive family members?
(I'd play the sister, you the brother and father. Balance of smut and story.)