Here is the problem. I've planned a three book series. The first one is definitely YA with both MC's in high school. The next one I think could be YA or NA. He's out of high school and she graduates about half way through, but they both still live at home. The third I think is definitely NA. He's probably 20 or 21 and she's a couple of years younger, but she had to quit school early due to life situations. So do I market this as YA or NA?