New Family, New Step-Brother, and Zayn (Zayn Malik Fan Fic)

When Allison Parker's mother decided she has had enough with her husband she takes Ally to live with a new boy toy. Ally moves in with Liam Payne and his father. When Ally starts to grow feelings for Zayn Malik things get intimate. Something happens that will change their lives forever. Will this change cause more problems? Will their love last through anything? Or will they call it quits and let another member sweep her off her feet?