Another csa survivor saying PLEASE stick to your guns.
Sadly I think you may have to disabuse him of other abuse myths too
Eg
That abuse doesn't happen in the presence of a protective adult or adults - it can, it does and it's all too common
That he will know who can be trusted - when I disclosed a few were unsurprised, several were visibly shocked.
That your child would tell you - I didn't disclose until I was in my 30's and even then not the full extent straight away
That when abuse occurs it is instantly of an extreme nature - abusers aren't stupid, they build up to worsening acts, they're also very aware of not leaving physical evidence
That they will abuse any child they have access to, so other people who were available to be abused and weren't can think this means it didn't happen - no, they have preferences and they are also very astute at working out who is likely to tell. If my dad had abused my sister she'd have instantly gone screaming to my mum. I was "daddy's girl" and I was confused and hurt and scared and didn't know who I could trust - he saw to that. He also convinced me I was at least partly to blame because I "flirted" and was "sexy" around him and this was reinforced by the forced hugging etc of family and relatives, and by my discomfort at his calling me "sexy" and wolf whistling at me from a very young age was dismissed as my being "uptight".
When I disclosed my immediate family didn't believe me initially. My mum came around a bit after a relative of hers steamed into her, she still disputes much of what happened. My sister point blank calls me a liar, we are nc now for this and a long list of other reasons. My brother was shocked, but eventually came around.
Consent and bodily autonomy start NOW, please stick to your guns op