Homeschooling question

So, give me your thoughts on this. My son, 7 1/2, has struggled with reading from day one. I have worked hard with him. He really can do a great job but he is definitely a boy who wants to play and not have to sit with me. I have tried to work with him to sit and focus but I also allowed him the opportunity to stand and throw a ball up and down while working through his phonics. He has come a long way. I have wanted to just see a desire in him to sit with a book. It happened last night. I put my children to bed with 30 minutes to read books. Noah asked if he could try to read a chapter book. I, of course, said yes. He chose one and he spent the next 30 minutes actively reading Stone Fox. I am sure he missed several words but it was the process of enjoying reading that I was pleased with. He got up this morning and immediately started reading again. He read several lines aloud to me and did well. My question is this.....my oldest was bothered when I allowed Noah to skip some other subjects because he wanted to keep reading. How do you feel about this? I really wanted to reward his desire to read by allowing him to just continue to sit on the sofa and read. He does well in the other areas but if he doesn't start feeling more comfortable with his reading the other areas will basically suffer. Thoughts?????