All of my kids got to a point where they disliked reading out loud to me. The teachers always said the kids should do it, but at a certain point when they were already fluid readers (1st grade-ish???) they each started to hate reading out loud to me. So, against teachers' wishes, I stopped making them do it. I just let them read for fun, to themselves, and kept telling them about all kinds of fun books that they might want to try.
I also still read to them every night (even though they are 15, 12, and 10) from books that hold my interest and have good story lines and good vocabulary and aren't always books they would think to pick up themselves. And also, I am always on the look out for them to read to me spontaneously outloud from things other than "their" books.
Also wanted to note that both my boys love fiction every bit as much as my daughter (although I, myself, prefer non-fiction). But, obviously, the subject matter that generally interests boys can be quite different that what generally interests girls. Some books that might stir your DS's interest are the Dragon Slayer's Academy series, the Chet Gecko series, the How to Train your Dragon series, the Time Warp Trio series, the Hardy Boys, and The Bobbsey Twins series. For a meld of fiction and non-fiction there is the Magic School Bus Science Chapter Book series. And, there is nothing wrong wih level-appropriate picture books. Fun content for an early-elementary boy with a late-elementary reading ability.
Edited to Add: My younger DS, when he was about your DS's age, would only read chapter books that had exactly ten chapters. I think he liked that because he knew what to expect and he wouldn't get sucked into a "long, boring book" that felt like it would never end. He always knew there was an end in sight, just in case he didn't like it, so he was less afraid to try a new book. Although he would also only read books that come in a series, in case he DID actually like it and wanted to read more. OCD much?
