Author note:
Just to clear up a few confusing details that AnaWinchester has brought to my attention
Astrid is about 18, almost 19, so she can live alone, also this is a modern AU. This takes place in the modern city of Dragon City, which is kinda like NYC. Hiccups father was killed in an accident, and his mother died in child birth, so he was taken to an orphanage, but once he turned 15 they cast him out as they weren't allowed to keep anyone there past 15. So he's been living on the streets for weeks. At the end of the story he is kidnapped by Drago Bloodvist and will most likely be raped and beaten. Astrid continues to care for Toothless as she knows Hiccup would've wanted that, plus he is her last reminant of Hiccup.
If you have any other questions please let me know