She-Who-Must-Not-Be-Named

Ooohh Sirius is in looove...but how long can he keep it secret from his friends, and more importantly, the rest of the school? With only a portrait of Newt Scamander to keep quiet, things look pretty good for Black and his Hufflepuff girl, Felicity Finlas (yes I made her up), but will the war tear them apart? (Set sometime before they joined the OotP/ TRYING not to be sappy)