Well, I think people have different levels of friendship. My feelings for someone like... say, Eishirou are quite different for someone like... Oshitari-kun, just on the basis of how long we've known each other and been friends.

I think you might have sone troubles as people don't normally just ask to be friends. It's more of a natural progression of enjoying spending time with each other and liking them for what they bring to your life. Perhaps you should try that definition.