High class wife descend to sex slavery

Dorei Keiyakushu is the story of a high class respectable wife witnessing how her husband brings home a slave girl and satisfy his sexual urges through humiliation and degradation of the slave girl. Eventually the wife finds her self becoming jealous of the slave girl and becoming attracted to their depravities. Then she ends up giving up her self to be trained as a sex slave and lives out her days in service to her former husband as his sexual play thing.