[Harry Potter: The Marauders' Era/Crossover] My Loyal Hound

Sibyl Stark is Tony Stark's older sister. The bold Sibyl was sorted into Gryffindor. Clever Miss Stark gets perfect grades in every subject (though Divination is actually Sibyl's best subject). As Lily's good friend, Sibyl naturally became the biggest obstacle in James Potter's early pursuit of Lily. But later, Lily became Sirius's best wingwoman as he tried to win someone over. Sibyl: ??? Theme: Bickering lovers