Maisie asks her friend Teddy to be her pretend boyfriend on a visit to her parents. But she realizes there are some important things she doesn't know about Teddy, and the day takes a turn that neither of them expected.
Fun fact: Maisie's line "No one said he needed to be dead" is a direct transcription of the thought I had when trying to figure out the final act of this story. Originally I figured that the bad guy had to die to end everything, but that seemed overly dark and an excessive act on the part of the protagonists. So I was trying to find places in the story to justify it. But then I realized "no one said he needed to be dead" and decided to have them grant him mercy.