Normally it's hard for Omega to get excited about his siblings' books, but some sci-fi is different. Depends on the series, though. "Which one? The one with the dog or the one with the robot made out of five airplanes?"

Even if it's not the cool one, it makes Delta happy. And books are not TV, so it doesn't matter if Delta's in the same room, no matter how irritating it is. Omega would have to literally read over Delta's shoulder.