The more I read the novel the more I understood Hugo is VERY horny he will take every chance to do it with her so I suppose having multiple bedrooms scattered across the castle is no big deal...
No, I've read it there. E.g. Chapter 109 part 2: "The more he held her, the more addicted he became, and lately, when it was the night corresponding to the one-in-five-days rule, he had to spend the whole night fighting off his desperate desire."
Why is there a bedroom in the library