The story involves a seductive display of anal contractions on a naive, fair-skinned, big-butt niece, J, who grew up in a prestigious girls' school. The niece experiences a shy, anal orgasm, followed by the insertion of a massive penis in a piston-like motion into her anus. (Kitayama Yu, LULU-399)

To attend an open day, I was asked to look after my niece who lives in the countryside for a few days. My niece, who grew up in a prestigious girls' school, is a pure and trusting girl. She discovered my AV collection, so I simply taught her anal demonstrations. Unable to resist teasing her clumsy anus, I couldn't help but insert it directly! I let her experience her first anal orgasm, ejaculating inside her tight anus! I poured a large amount of semen into her unexplored anus!