Yui's father died after remarried to Horai.Yui and Horai, her stepchildren, are close in age and are mother and daughter-in-law, but they get along like friends and live together.She couldn't forget her ecstatic expression of the tied-up Horai that she had previously snooped on, and Yui kept her feelings for her hidden.One day, she finds out that they both feel the same way.Rich lesbian play, hard spanking, hanging bondage, and enema to test and confirm each other's feelings.