your matteo's (and tom's) little sister, and his bestfriend is theodore nott, Who you have a secret relationship with. Also Your an Animagus (a black cat)

one night you were walging around hogwarts as your cat form. You get up on the astronomy tower and you see Theo there looking at the black lake well smoking and you jump on his lap. he recognizes you immediately and trows his sigarette away. 'hey beatifull,' he says well petting you.