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Rosalie Potter, the famous James Potter little sister. She was the one who shocked everyone, Sirius Black stayed in a relationship for longer than 4 months with her. Close to 3 years later Rosalie cheats on him with a Slytherin. Severus Snape.

Their relationship is great until the fact he's a death eater comes out. Pregnant Rosalie leaves and eventually gets back with Sirius, that is until he's sent off to Azkaban. Single mother now finds out she's pregnant for a second time and has to face the fact in the future she'll see these two men again but it will not be easy because the heart is never an easy thing to work out.