FSDSS-915 On a double date trip with a best friend couple, I started having a good time with my best friend's sadistic boyfriend...we secretly had sex and my sadistic side blossomed. - Yuna Hina

Couples Yuna and Masashi and Ai and Teruda, who attend the same university and belong to the same club, often go on couple dates and are all friends. - The four of us went on a trip because our anniversaries were coming up soon. - Even though they knew it was no good, Yuna and Terutahi went on a one-night, two-day trip where they had sex without telling each other's boyfriends and girlfriends. - "I love my boyfriend, but my sex compatibility with my best friend was the best..."