Sirius Black was his best mate since they met on the Hogwarts Express in 1971. James Potter believed that he would be the most important Black in his life. However, James soon finds himself in a dilemma. He had fallen in love with a girl the moment he laid eyes on her. There was a slight problem. She was his best mate's baby sister. Oh Sirius was going to kill him. [this work can also be found on AO3]