Poor sub is on the stage one more time, and in this session, pain source is Mistress Mia. She probably is not satisfied by training level of sub, so once more She wants to train him herself. She makes him lie down on a bench, his back completely exposed, She whips the slave with all Her force. Then She turns Her attention to slave's useless dick, and squeeze it till poor guy can't keep his silence and start screaming. We will see, if sub fits Mistress Mia'a y requirements.