[Kaikandrug (Kotomaro)] Slipping It Inside My Little Sister [Decensored]

A twin-tailed schoolgirl in a pleated skirt and knee socks tags along to peek at her brother's university research room, never imagining what 'Onii-chan' has been hiding behind his studious facade. When the lights dim and she's meant to be sleeping, the thin excuse that 'if it's just the tip, it's okay to do it raw, right?' gives way to something far deeper that leaves her trembling and calling his name through tears. Uncensored and unrelenting, this title strips a reluctant little sister bare for the brother she thought she knew.