Little Devil Sister In My House

Mao-chan is a cheeky high school girl who loves to tease her virgin big (step)brother in naughty ways.

However, her true intention is actually...?

(Source: BookLive)

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Note: the original Pixiv series has been collected and published into 2 volumes.
Volume 1 contains chapters 1-20. Volume 2 contains chapters 21-42.

Links:

• Alternative Official Raw - BookLive