A female college student named Gotou, who was troubled by her recent enormous increase in bust size, sought advice from her senior, a busty K-cup, during her school days, Yuzuki. Yuzuki encouraged Gotou while also being drawn to her fluffy, soft I-cup magic, and couldn't help but bury her face in it. While lifting it up with both hands and squeezing it, she licked around the areola to the nipple with a saliva-soaked tongue. Despite her heart's refusal, when Yuzuki thrust her boin in front of Gotou, she couldn't resist and sucked on the elastic breasts...