Situation

Currently i have a friend who's going through some crazy shit. An event happend between him and his step mom where she plopped into his bed and started spewing off about them being lovers in past lives. She noted that she was having premonitions about them and asked if hes had the same. My friend stated this was early morning and he was confused and wasnt sure how to process what was happening. He recalled his step mom deliberately showing off her ass and looking back at him. His dad had face timed her in the midst of the convo to which she said, "ill go downstairs so he doesnt get suspicious of us." Well the next day I get hit with even worse news. She stepped into his room and they conversated for abit before she hugged him. This hug led into a kiss and then kisses down his neck. He stated he was frozen and couldnt push her off fast enough. Im not exactly sure what their conversation was prior or after the kiss happend, he was very shaken up and didnt really elaborate. Ive told him that he was sexually assaulted and that he would need to tell his dad but he doesnt want to be the cause of their family split. I tried to tell him that no, his stepmom is the one who initiated all of this and is the cause of anything that transpires after. I cant help but feel terrible for my friend and Im not exactly sure what else i could do for him in this situation. Ive never experienced anything like this in my life so its difficult to relate and give advice. Ill be praying for him and his family tonight, seems like thats one of the last things I can think of.