it didnt work for us as well this time round, but to make sure DS2 is as into books as DS1, we keep a lot of books around him at playtime and read them at playtime ecven if its 1-2 pages and I let him play with the books so he gets familar with them IYKWIM
make loads of funny faces, noises and stuff to keep them excited. It worked for DS1 who is a book addict and his latets hobby is to make his own books! he draws the pictures and then asks me to write out what it means and sometime she writes a few words himself!