@Mewples using her as central heating is a viable option that I hadn't considered. Hmm… 🤔
Self-conflagulating body pillow. Though, if the human king is actually his father 😂😂😂 maybe, he's doing this as an excuse for his son to get married? 🤔 Like, maybe, he refused to get married and has been all broody single, so he played the "evil-flip-sides/evil-faced-turn" card, but secretly was doing it all for his "family" (grandma wants her grandchildren!). The Queen has to heat the castle so the king's new demon siblings don't freeze in the frigid human castle—she's all angsty as fook, and is awaiting her grandchildren. 😂
😝
Gotta make it interesting.
Son this either his father betrayed them or they died by human hands when in reality the human king is dead & replaced by his father and mother, and the Mom has to fake her status as "prisoner". Maybe, the hero is really their chosen match for their granddaughter? 🤔
Fascinating
Grandma would be extra cranky cuz she's had to play the captive heating unit all this time. Just imagine all those secret S'MORE cuddle moments in the dungeons. Likewise, are his siblings all in disguise as humans?
Likewise, since the Demon King is part human, maybe, an alternative story is their parents got into a HUGE fight and so the Dad conquered the human territories or declared himself King (if the human realms were under the Queen's control), and when she came to apologize, he yandered her in the basement? 🤔
Alternatively, maybe, the human king is the yandere love interest who killed the father & locked the Queen in his dungeon, and is trying to conquer in order to wipe out the child of HIS Queen? 😉😂😂😂