Is it obligatory for someone who committed the sin of masturbation while fasting for the expiation of accidental killing to re-fast the days following the sin?

If a fasting person masturbates out of ignorance that masturbation is forbidden and breaks the fast, then his fast is valid, and the continuity of his fast is not broken. However, if he knows that masturbation is forbidden and breaks the fast, or he knows that it is forbidden but is ignorant that it breaks the fast, and he masturbates until he ejaculates semen, then his fast is corrupted and its continuity is broken, and he must resume fasting for two months.