It's always great to get a glimpse of young Snape and his relations with the Marauders, and this fic didn't disappoint. Snape would probably refer to Sirius and James as Black and Potter, though, since using first names is more for people who are fairly close. But that's just a little nitpick - it didn't interfere with my enjoyment of the story at all.

It's Sectumsempra and Snape couldn't have made it in 5th year if it's after the Marauders used leviosa against him because that was during the OWLs, after which they had no more lessons till the next year.

Nice...I'm guessing this is a one shot?