"Eh... Sana-chan!?" Mistaking his girlfriend's younger sister for his girlfriend and giving her a deep, passionate kiss, he then makes love wildly with her, blushing and tongue-entwined with him after his first kiss was stolen... Ikuta Sana FNS-214

Hearing that my girlfriend's family wasn't home, I excitedly went to her house to spend the night. Of course, we flirted intimately, and that night, wanting to make love, I gave her a deep kiss. But I felt her resistance, and upon closer inspection, I realized the person I was kissing was her younger sister, Sana-chan. I immediately apologized, but this seemed to be Sana-chan's first kiss, plunging me into a major crisis. However, Sana-chan blushed, displaying an expression that was hard to tell whether she was angry or sad. The next day, when I woke up, Sana-chan came over and tempted me with her lovely lips, saying, "I want to kiss you."