Sirius, James, and Peter execute a chaotic pixie prank in the Great Hall, which turns delightfully personal when Bellatrix is caught in the mayhem. Under cover of James’ invisibility cloak, they escape unnoticed, pinning the blame on the Prewetts. Later, the boys gather in the Astronomy Tower, where Sirius opens up about his family’s obsession with star names, sparking teasing and warmth among the group. The chapter ends on a soft note with Sirius insisting on celebrating Remus’ birthday — despite Remus’ protests.