The Werewolves Twin (Marauders FanFic)

Instead of a skittish, pudgy, boy named Peter following Remus around, it was a outgoing, skinny, girl. Ruby May Lupin is Remus John Lupin's twin. Those polar opposites, they are inseparable. Remus is a quiet, shy, boy and Ruby is a outgoing, loud, girl, though try and separate them and you will raise havoc, until third year, then you can separate them, because she has other friends. She instantly takes a liking to James and Sirius, and eventually Remus comes around, and eventually means by the end of the train ride to Hogwarts. So, this is Ruby, the werewolves twin.

(Peter won't be in this, but someone else who is exactly like him except he's skinny will be)
(Also, I changed Ruby's animagus, instead of a cat she's now a Pyrenean Mastiff, I know, big change, and big dog, but I couldn't resist the dog)