Reina learns from her brother (Pixiv Fanbox)

Reina is still a virgin.

In Aki-star culture, the first experience is done with one's immediate family.

She has an older brother, so it would be her brother, father, or grandfather.

Reina seems to do the deed with her brother.

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Reina: Ryo,I'm back, thank you for your patience.

Reina:What should I do?

Ryo: Hmmm, I'm just teaching you the opposite of what my mom taught me too...