convert <!–nextpage–> to expand?

Just wondering if anyone could point me to a suggestion or plugin where I could convert <!–nextpage–> to an expandable/collapsable thing? I was thinking of using the “show/hide” for the <!–more–> tag, but that won’t work for multiple <!–more–> tags, I don’t think (and if it did, then they would all be inside one another). I’m trying to figure out how to convert it to pages, so I can have multiples on one Page, but I was wondering if anyone could point me to a plugin that might possibly exist that already does this (or someone else maybe has already figured it out?)