Hi! I'm a beginner at Chinese Webnovels and I don't understand what "warming one's bed" means. I've seen it in a couple of novels but it is still a mystery to me. There's a lot of thing I don't understand in Chinese novels such as giving face, having the urge to vomit blood, etc. but I can infer. It would be great if someone could explain to me both the literal and figurative meaning to this. Here's a few examples of it in a sentence:
"Shall I warm your bed for you, young master?"
"If you really do this so that blah blah then I would warm your bed for tonight."
"Kyaaa! (Fangirling) This little one can warm your bed for you tonight, Famous laoshi!"
What I got from this is that people get their servant to warm their beds. And the act of warning the bed of someone equals being a servant to that someone. I am still unsure about this and thus needs clarification. Google doesn't help. Sorry and thanks in advance.