Tmntlittlesibling Stories

Y/n, a name that evokes old and painful memories for the turtles. The lair was never quite the same. It was an accident; it was supposed to be fun! It was just a little game... A little game that cost them their sibling. ~ ~ ~ ~ What happens when a new foe(?) comes to New York? And forgotten memories are forced to the surface, whether they want to remember them or not? (GN! Reader) (2012 TMNT!)