Great story idea
This is a really promising story, I love the idea behind it.
Read the story now
Something I would point out, if you don't mind, concerns your narration. Make sure when you are writing, the characters should appear like they are telling the story and not you i.e we should see things from a character's eyes/perspective. Each chapter/section should be focused on one character telling the story, e.g Chapter 2 began with Amore then you should continue telling the story from her perspective (switching is allowed but for a starting writer, it's always recommended to stick to one character)
Here are 2 rewritten paragraphs:
"Hello, Matteo," she said
"Hello, little sis." The deep familiar voice came in reply.
"When are you going to be home?" She bit her lip, hoping that smart brain of his wouldn't understand the intention behind her call.
Leonardo gave her a look. The guy knew her so well, he knew that a phone call was always her go-to means whenever she wanted something, knew that she believed it was the most effective means to getting whatever she wanted from the other party.