For “Heated Wizardry” to land, viewers had to have at least a passing familiarity with each story’s component parts: the enemies-turned-lovers arc of Reid’s protagonists, Shane Hollander and Ilya Rozanov; the broad strokes of Rowling’s boarding school for magical kids. Fans of the former could get a kick out of seeing Wolfhard and Marshall in saucy stretching poses previously struck by the Heated Rivalry stars Connor Storrie and Hudson Williams. Fans of the latter could enjoy the realization of online fan-fiction fantasies pairing Harry with his best friend. And the gags kept coming: Harry and Ron canoodling beneath an invisibility cloak; barely coded sexts sent via owl; Jason Momoa, popping up as Hagrid, punning on the name of Harry and Ron’s classmate Neville Longbottom.