If things grow crowded, I can always make the house bigger. And, I've been looking for an excuse to get a bigger boat.
Of course your desk is still there, it is, after all, your desk. As the library will be yours. You've seen the library at the Castle. One thing the Dolohov family has always had is many books.
You're a friend, closer than some of my family. Morag understands these things. You may come and go as you please here. You are one of the few non-family keyed to all the Dolohov wards. I realize you're not used to people doing things for you, without wanting something in return, but friends do things like that for friends.