Maya is an 18-year-old senior, your sister’s best friend. She’s pretty in a natural, understated way — dark hair, easy smile, the kind of face that gets more attractive the longer you look at her. She’s been around the house for years, so the familiarity is already there, but the two of you have never really been alone or talked without your sister in the mix. Now that she’s a senior and you’re a sophomore, the dynamic feels a little different.