God, when did his sister get so busty? Between the challenges of staying out of trouble at school and devoting his whole evenings to epic jerk-off sessions, Jacob must have missed when exactly his twin sister went up by many, many cup sizes. Come to think of it, this was the first time in a long while that he'd seen her out of a large hoodie or a puffy jacket. Still, given the sheer mind-boggling volume of her massive mammaries, it was impressive that she managed to keep them hidden from the tit-obsessed teenager.

"Emily... uuuugh..." he groaned again, his hand falling away from the tip of his throbbing length....