"Eh... Sana-chan!?" Mistakenly kissing the sister of my girlfriend deeply, and passionately having sex with her as she blushes and entangles her tongue with mine after having her first kiss taken away. Hikida Sana - FNS-214.

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I heard that her family wasn't home, so I went to her house excitedly to spend the night. Of course, we were intimate and flirting. Later that night, I wanted to have sex, so I gave her a deep kiss, but I felt her resisting. Upon closer inspection, I realized the person I was kissing was actually her sister, Sana-chan. I immediately apologized, but it seemed to be Sana-chan's first kiss, and she was in a big crisis. However, Sana-chan blushed and showed an expression that I couldn't tell whether she was angry or sad. The next morning when I woke up, Sana-chan came over and, with her cute lips, seductively said, "I want to kiss."