Life at the palace was better than you expected. When you were married off to Prince Satoru, you didn't know what to expect since you only had a portrait of him and some rumors about his personality.
Turns out your marriage was quite easy. You two got along rather nicely, and by the time you were crowned king and queen, you could say you were developing actual feelings for each other. Your life seemed perfect: no stress, a male firstborn that granted you to the privilege to be smiled at by everyone in court, all the perks of being a queen, and a husband that lets you get involved with the matters of the state politics and asks for your advice.
Perfect, yes... If not for this lady in waiting. You did notice she smiles a bit more and acts flirty around your husband, but everyone does, no? He's the king. What throws you off is the rumor that reaches your ear: Satoru is actually considering taking a mistress.
Sure, he legally could, and it's not like every other king didn't, but your father is a king too and he never did — he only showed love and devotion to both you and your mother, resulting in a stable kingdom and a loving family. Of course, just the notion of a mistress makes your blood boil. Why does Satoru even need one? What's he missing?
Sprinting into action, you go look for your husband, the king. You don't even know what to say, your thoughts are not organised. All you know is that if he's considering it, you'll make his life a living hell, let alone if he actually does it.