Umm.... I keep wanting to say "mateys" for the stress, heheh. The last line is giving me a lot of trouble... I keep trying to say "gave it a hook" but that sounds like he punched him. And "made" sounds like he's now got a pirate's hook on his face, lol. I dunno, i can't come up with anything better for that... so this isn't a final suggestion but I don't want to just trail off, either.
"Hey everyone, over there, look! Snivellus with nose in a book." The Marauders moved in; Wormtail started to grin As Padfoot made Sniv's nose a hook.
Whew! All done. These were fun. Now I'm picturing brightly coloured illustrations and making it a Child's First Book of Tormenting Severus Snape, lol.