[Hawk Bit (Kouji)] JK-ka Refle 4 [akanameTL]

A big brother reshaped into a girl—molded into the spitting image of a twin—gets escorted into a real high school classroom by the very younger sister who transformed him, collar in hand and hierarchy inverted. She teases whether living as a schoolgirl arouses her 'big brother,' then flips their sibling order entirely by claiming the older-sister role for herself, pinning her transformed sibling beneath a strap-on while debating who is truly the one being ravished. Between sworn-sister promises and the admission of losing to desire, this twisted bond tightens with every collar-fastened step.