The annual homecoming day has arrived. My parents have already passed away, and my hometown is now inhabited by my sister's family and their daughters, "Rina" and "Hikaru." Rina, the elder sister, is serious and composed, while Hikaru, the younger one, is cheerful and full of curiosity. Ever since childhood, they've playfully fought over who would marry "big brother," and I've watched them grow up day by day. Year after year, my nieces have transformed from children into young girls. Being someone with no immunity to women, I've gradually found myself aroused by their developing bodies and close proximity. Last year, I could no longer restrain myself and ended up sleeping with the younger niece, an act that still burdens me with guilt and regret. Now, once again, the homecoming season returns, forcing me to hide my true feelings in front of the sisters.