(y/n) and Sirius Black have been enemies since the day they met at the sorting hat ceremony. No one really knows why the two bicker like children, perhaps it's the way Sirius would always style his hair in class or perhaps it was the way (y/n) was so focused on her class work all the time rather than breaking the rule...
This has been drastically edited, so I highly recommend reading the rewritten version (which can be found on my account) as it is much better Y/N Black was Sirius Black's twin sister. The only female marauder. She is like her brother in many ways that she wont admit, they're both cocky smartasses with a sense of humou...