She hasn’t let you touch her let alone see her naked for months...she was always absolutely disgusted by your pathetic cum. Meanwhile her new bull gets to do this daily. And you can’t even watch anymore.
Your mum agreed to suck off your bully as a last resort to get him to leave you alone. Her two demands were that he not film it, and that he not cum in her mouth. But, as you could have told her, he does whatever he wants.