Keiyaku Shimai - Vol. 3 Ch. 16 - A younger sister who loves her older sister

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"My Sister's Best Friend, My Lover." all over again, except both of the sisters were unstable and unsupported enough to rely on a destructive, incestuous relationship.

The older sister made mistakes in dating the best friend instead of the younger sister. Also the younger sister never let the incestuousness affect her actions