Mum Gave Classmate A Footjob

My classmate has always been a pervert and a huge foot freak, never really liked him. He got brazen when he photographed my mums bare soles on her car dashboard while she waited for me. He always claimed he would pretend to be my friend to get close to her which I ignored since no one liked him coz of his weirdness but the other day he came in claiming he had a footjob from my mums soles the previous night and when I told him to prove it, he showed me pics of his dick on a very familiar pair of mature soles then others with his cum all over them. They look exactly like my mums feet and tbh I'm shaking with a mix of embarrassment and arousal and don't know what to do