Bound by a baby

Justin is your number one enemy and from a rival family. 18 years old and is your neighbour! you: from a rich family, girl around his age(sorry boys) and maybe has a soft spot for him? So one night during your 18th birthday party, he pops in to destroy it? anyway, while you were arguing, a mailman came to you with a delivery and you found a baby in the box! what will you do? . . . don't listen to the voice, it's bad!