The broken promise

Alexandria and Hanna have had a normal sibling bond, but then Garrett Graham came into the picture. Alexandria met him when Hanna brought him over one day, and from there, Alexandria and Garrett's relationship only grew stronger and more sexual. Hanna notices this and makes her sister make a promise to make sure she doesn't do something stupid with Garrett. Will it work? Will Hanna and Garrett stay together? Will Alexandria listen to her sister and break an age-old deal with Garrett, or will Alexandria break the promise she made to Hanna?

This is mainly for me, and it is a The Deal by Elle Kennedy thing I wanted to see here. This is mainly for my sanity. ⚠️ Warning there is mention of abuse, weapons, self-harm, suicide, sex, drugs, alcohol, age gaps, rape, and death.⚠️ Don't comment that I didn't warn you.