During the summer vacation, my nephew Satoshi came to visit my aunt's house, which I had admired since I was little. He was happy to be alone with his aunt while his uncle was away on a long business trip. However, his aunt finds out that she is a virgin and teases him, saying, "Should I let her graduate from being a virgin?" Satoshi's rationality is driven to the brink of collapse by having big breasts forced on him half as a prank.
