Teach my Heart to Stop Again: part 2 of a Heartstopper AU fan fiction

This should be read after Teach my Heart to Stop or it will not make much sense.
Nick and Charlie have returned from their romantic holiday to France, newly engaged. They have a lot of planning and talking to do and talking, well, leads to other things.
School will be back soon and there will be many changes and new challenges for Mr. Spring and Mr. Nelson to overcome together.