wife can masterbate her husband when she is at her mensus period and also learn that self masterbation is not permissible..

in one of your Q&A I read that wife can masterbate her husband when she is at her mensus period and also learn that self masterbation is not permissible..if so can she hold the penis and masterbate him until the ejeculation occurs.2)can she do this exercise at bath room also until husband ejeculates? .is it permissible? please inform us.