Remus had infected you. He was sure of it. You were involved in the prank, he clawed you....maybe bit you? He doesn't remember. It's still a blur. Right now he's laying on his bed, staring at the ceiling, recovering from everything. He took a deep breath and got up, going to look for you...he saw it

The very thing that made him certain that he has in fact infected you.

You are infected...just not in the way he thought. You had the features they just weren't hidden....you grew a tail...a wolf tail. He was Silently wondering if he'll have to take you with him during full moon periods...this isn't going to be fun.