A kiss and a promise - Newtina fanfic

There is a time gap in COG between the events at the Père-Lachaise cemetery and the moment the party appeared at the Hogwarts bridge. I was triggered by a deleted scene of COG ('the croissant scene') where Newt and Tina were exchanging looks and acted like.... something had happened between them..... things we didn't see on screen, but definately gave their romance a little more certainty. This video inspired me to create this short story, which fills that particular gap. Is it possible the following events took place...?

Please note: You should watch FBAWTFT and COG first before reading this short story....
Also this: I do not own the characters in this story, they and the whole wizarding world are JKR's. This short story is just a theory, written down by a fan with a huge Newtina craving....

Hello everybody! I'm active on wattpad since oktober, and new as a writer. I read several of your lovely stories. I like these stories a lot, and now I have tried to create one myself. An apology in advance: English is not my mother tongue, so I hope I didn't make too much mistakes.... If you find one which annoyes you, please notify so I can try to adjust it. I hope you enjoy this story!