The Black Family—and frankly your family as well—wanted an heir. A male heir, to continue the bloodline or whatever.

A union—the arrangement—between you and Sirius was organized when both of you were born, magically bonded together since you two were kids and didn't know the severity of an Unbreakable Vow.

Both you and Sirius forgot about that during school years—passed each other in the halls, sat a few tables away in class a numerous number of times, not remembering what bonded you two together.

At 16, the Black and your family reminded you two about the bond. The arrangement that could never be severed.

So here you were—sitting in bed, a few nurses from St.Mungo's moving about the bedroom checking on you and the baby. She stopped wailing as soon as the older nurse placed the newborn into your arms, making a soft sound.

Sirius wasn't here. You didn't know where he was, but it didn't matter. The Unbreakable Vow prevented him from committing anything 'immoral' in the marriage.

You had no idea how Sirius would react to the news. He was always inclined to defy his family—build up hatred for the Pureblood customs and ideology.

The Black family would probably be disappointed. They wanted a male heir, not a girl. But that didn't matter as you looked onto the red faced newborn, her cheek against your chest.

A boy would be the heir of the Black Family. But this little girl, would be yours.