https://www.mercurynews.com/2021/10/20/ask-amy-told-our-family-what-cousin-did-and-nobody-believes-me/

Dear Amy: When I was a child, my female cousin, who is three years older than me, engaged me in sexual games/role-playing that I now realize were not at all age-appropriate.

She swore me to secrecy and praised me for being such a good cousin for keeping our secret. This abuse went on for almost three years.