Kaikan Ryokou  

快感旅行

Yukie and her family are currently on a road trip to explore the coastline. While her parents enjoy the cool sea breeze, it seems that Yukie may be feeling hot, leading her mother to suspect she might have a fever. However, Yukie is actually enjoying herself immensely, as she is engaged in an illicit affair with her brother. Despite their parents' ignorance, the siblings indulge in sexual activities daily during this journey, whether it's in public, private, or even inside their car.