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After losing a bet to Pansy Parkinson, nine Slytherin men are handed one spectacularly humiliating forfeit: secretly form an a cappella group and serenade Y/N with “Birthday Sex” at her surprise party. Add matching suspenders, ten independently chosen gifts, increasingly chaotic rehearsals, and the dangerous possibility that performing an explicitly sexual song for a friend might make someone see her very differently. What could possibly go wrong?