[Makin] Learn Judo

A smug older boy laughs off the idea of learning judo from a tiny girl mentor—until she pins him under her bare ass for facesitting sessions and scribbles tally marks across his soaked body whenever he slacks off. His little sister tightens the grip with help from a well-endowed playmate, locking him in a chastity cage and strapping in to prove that whoever wields the bigger cock makes the rules. By the final chapter he's collared, leashed, and bouncing on a mounted dildo, reshaped into a busty pretty girl hungry for even more training.