HELP FOUND OUT MY SON HAD SEX WITH A TRANS

41 year old antivax autistic boymom just found out my 16 year old son slept with a 17 year old trans girl in his 12th grade class during a field trip. He was fully aware that she was an evil trans monster and despite this seemed to really enjoy it, calling her “the hottest piece of ass on the middle school playground”. How do i retroactively inform him this was rape. She also said a sentence to my 12 year old son in passing, i’m assuming to groom him into becoming one of her concubines. Who do i inform to arrest to rapist-at-large???

uj/ based on a real phone call i got as a 911 call operator last year