from what I remember, plot goes as:
•FL and her brother are living together
•the brother has a friend who is also their neighbor since they are kids
•the brother had some work to do and left her sister in the care of his friend
•the fl has a thing for broad chests
•she got drunk and left hickeys all over the ml
• the ml warned her to be careless and if she repeats this mistake again he would get back at her
•the fl got drunk and did it again.