'I see how you look at my sister.'

(p2/brother's best friend)

IN WHICH, you are the sister of James Potter, and you have a crush on Sirius Black. Now there was a problem—Sirius was your brother's best friend. They would probably marry each other if they were both single at 30. So, you kept your feelings to yourself. Until one drunken night at a party, where you had found yourself in Sirius' bed. It was a one time thing... that kept happening. Now, James and Sirius had a huge fight, and they're yelling at each other across the common room. With a single glance at you, James suddenly yelled something neither you or Sirius wanted him to know.