Bella was 15 years old at the time. She didn't have much of a relationship with either of her parents but was more comfortable with her mother. She'd recently came to the discovery that she was to marry someone not of her choice. This infuriated Bella so she decided she'd try to anger her parents in any way that she could. So she went out late at night and did things she shouldn't

Narcissa seeks Bellatrix for comfort after Cygnus has beat her No blackcest. Warning: abuse