Seventeen

*ONE-SHOT* On Severus's seventeenth birthday, Sirius takes a chance on letting the other boy know that, despite his best efforts, he's gone and developed a crush on him. Determined to make Snape's 17th birthday the best one yet, Sirius sets out to save Snape's life and gets a little more than he bargained on, but certainly nothing he's going to complain over. Sirius/Severus!