A band of brutes lust after a married wife who has a curvy, voluptuous body.
The wife is treated like a dog bitch, degraded and used for sex...

The son of one of the brutes turned men is brought along for the ride,
And what he sees is that the bitch his classmates have been fucking, and turning into an obscene sex toy is no other but his own mother.
And he himself also...

[From DLsite English]