Conflict arises as Sierra tries to stop the streams but can't, or as she becomes more addicted to the power and attention. The story could end tragically with her losing herself, or maybe she finds a way to break free.
The fans changed. They started carving fleshcode tattoos into their arms. They sent Sierra .wav files that, when played, whispered her name in 5/4 time. She stopped sleeping. Her Stickam alerts never stopped. The entity’s comments section became a hive-mind of [STICK. EM. FULL] —a command she didn’t understand until the night she dreamt of a mountain (Sierra Nevada?), a cave with teeth, and a glowing USB drive labeled “SIERRA xXx FULL.”
I should think about a plot structure. Maybe Sierra is a grindcore artist who starts streaming on Stickam to gain fame. As her streams become more intense, she begins to experience strange occurrences. The music itself could be channeling something evil, and the more she streams, the more it affects her mentally and physically. Perhaps her fans start to act strangely too, becoming addicted or possessed. The climax could involve her choosing between stopping the streams and losing everything or continuing down the dark path.