EKDV-658 My virginity was taken by my sister... For me, who just got a girlfriend for the first time, my kind-hearted sister Asuka Morise became my sex practice partner.

I never imagined my sister would become my sex practice partner! Asuka and I are close siblings, she's bright and energetic. Lately, she found out I'm still a virgin and keeps making jokes about it, which is a bit annoying, but she's cute even when she does that. I feel great today! Because I have a girlfriend now! Asuka was happy for me at first, but then started to worry, "Are you sure you're okay, big brother?" Then she suddenly suggested, "Hey big brother, you've never had sex before, right? Should I teach you how?"