You barely were able to complete your winter exams, over your massive FF Breasts. Over the winter break, they grow several cup sizes, with James finally going all the way with your H Cup breasts.
Soon, your uncle sits you down when they've reach II Cups, and tells you of his involvement in your "developments". He tells you he forgets how far they're supposed to go, and he lost the gun when they last moved, leaving her stuck with them until they finish growing. By the time spring break ends, they're each now the size of two volleyballs each.