Sectumsempra
cerasi
'Smile, Black,' Severus growled. His wand was prodding into Sirius' chest, and Sirius felt a distinct sense of disadvantage as he stared at his own wand, held firmly in Severus' other hand.
'Why should I smile?' Sirius asked. With the exception of the sweat on his brow, one would think, by his manner, that he was picnicking in some cosy forest glade with his great Aunt Mildred, if only he actually had such an aunt.
'Smile for me,' Severus sneered. He poked the wand harder into Sirius' chest and waited. 'This is a very happy day for me, and you should celebrate with me. Today I get to try a new curse.'
'Really?' Sirius asked. With the exception of the unforgivables, Sirius couldn't see anything ahead of him that he couldn't get out of. 'And why is it such a happy day? Big nose and hair as greasy as yours, I don't think I'd ever have a happy day.'
'Shut up!' Severus snapped.
'Make me, Snivellus,' Sirius retorted.
Then he saw something dreadful in Severus' eyes. It was an anger that Sirius had never seen the like of, not even in Severus' black pits. Take the angriest Severus had ever been, add that to the angriest Sirius' mother had ever been, and then multiply it tenfold. This was fury and rage, combined in perfect, destructive harmony. Sirius swallowed.
'Sectumsempra.'
