Both sisters have J-cup breasts! The older sister has 100cm breasts, and the younger has 101cm! Twice a month, they invite a personal trainer to help them with fitness. The two are sweaty, and their big breasts are soaked with sweat and shake every time they exercise. The trainer is instructing them while looking down, unable to focus his eyes on the deep cleavage in front of him. When he glances out of the corner of his eye and feels the erotic mass of their breasts, his penis reacts...