Apple Bloom based on the My Little Pony: Friendship is Magic TV series. This story takes place during season 8. The season acts as a backdrop or is notably changed throughout the chapters.

Apple Bloom becomes angry when Applejack confesses to having become a vampire through becoming one of Rainbow Dash's fledglings. She does manage to calm down when Applejack informs her that Rainbow Dash is telling Scootaloo, so Applejack wanted to be the one telling Apple Bloom these things. She figures out that Rarity will be informing Sweetie Belle of much the same. Afterward, on learning more about mevs through Sweetie Belle, she becomes curious about Applejack's title, which she will learn is Fyra.

Apple Bloom's role throughout the story is not as prominent as Sweetie Belle or Scootaloo, but she will still be around for many notable events involving her friends and/or Applejack.

Chapter Appearances with dialogue:
Chapter 14 - Revelations Continue
Chapter 15 - Marked Filly Curiosity
Chapter 18 - Appealing Danger

Sample Dialogue from the actual My Little Pony: Friendship is Magic TV show: https://www.youtube.com/watch?v=uzRw7OWOwWs

Context and italicized audition lines:

0 - [Context: Applejack is starting to confess her fledgling status, but Apple Bloom is figuring out it slightly ahead of what Applejack is telling her.]

"Whoa, wait a minute, are you telling me that you're a vampire now as well?" Apple Bloom asked in alarm.

1 - [Context: Apple Bloom is calming down after Applejack explains the confession is coming from the fact that Rainbow Dash wanted to tell Scootaloo, so the older sisters figured they would tell each younger sister separately. ]

Apple Bloom sighed again. "Alright, fine. I get it. But as your younger sister, I will be looking out for you and what this vampire 'condition' does."

2 - [Context: Apple Bloom is referring to the fact that the mevs won't let anyone watch a live exchange of magic since they consider it an intimate affair.]

"I know, but doesn't having it be forbidden make you want to see it that much more?" Apple Bloom admitted with an interested smile.