Through Transfiguration

In which Marina navigates her years at Hogwarts. Her childhood friend is sorted into a different house, she gets roped into tutoring first years, and there are these four Gryffindor boys in the year below her that she somehow winds up friends with. She also sucks at transfiguration. (Marauders-era, EVENTUAL SiriusxOC, background Jily)(RATING RAISED TO T FOR TEENAGER-Y ANTICS)