Saw something wrong between mom and tution tutor

Yesterday I was Studying with my tution tutor and at that time my mom was taking bath and after that she have to go in her room, so she goes in towel which my tutor seen. that after a while he told me I'm going for washroom, you just do work he goes to the washroom gate but then turned from there to mom room, then I want to check what he was doing and I saw he just completely standing there in front of her ass while my mom is naked fully, he spanked her. At that time she was applying lotion but what should I do now.