Aight, so there's the companion sword to Sieg's. Fem sword is FtM, Masc sword is MtF, the Queen's can probably hold a soul too if she dies with it. Protagonist is the daughter of the princess, hidden away in a small village and glamoured with a curse which causes her to be ignored. The guarantee of no arousal may be a side effect, or intentional to ensure the royal bloodline doesn't continue in a side-branch. I suppose she could be like... the princess' twin. I don't know what the ages here are supposed to be. It would make sense, but then you'd think the Queen would be aware of the situation in that case.
Also you know, I thought this series jumped the shark with dragon-fucking but it's really been out here proving that there's still an ocean full of sharks out there and it's got a rocket-powered jet-ski.