Read this so many times, still one of my favourites.
Although, there's something a little funny about how such a cute and fluffy story is just completely covered in pictures of mostly-naked middle school girls holding and touching each other. Like, the front cover, the back cover, the inside cover, in between chapters, everywhere a space can be found, it's filled with middle school girls sans clothing. Really gives you the wrong idea, doesn't it?
Edit: Or maybe it doesn't?! I seriously forgot how soon they start having sex! It's not really focused on that much, but they really can't keep their hands off each other once they get together. Well then.