I was Molested by my sisters friend

When I was younger my sister had this friend that would baby sit us , I remember like yesterday she would make me go under our bunk bed with her and force me to suck her huge breast and say things like “ don’t you want them to get bigger” I was Mabye 8,9,or10 at the time and she was about 4 years older than me . I believe more was done with vaginal area but I can’t remember well so I will not even mention

I am now 31 and it still bothers me for my big sister is still friends with her till this day and I have been at events that my sister holds abd she is there with her husband and kids

I did tell me sister years later and she kinda just “ oh really” “ wow “ and “ that’s crazy “ but it never changed her relationship with the friend .. I also know that same friend also molested my younger sister( 2 years younger than me ) for she described the same things to me about her forcing her to suck her brest so I knew it was true

I kinda resent my older sister for still befriending her even though she did that to us when we were younger it still bothers me and I make I try to make jokes when I talk to my sister so I’m not so uncomfortable and say things like “ oh you where taking to my molester” things on that sort

Part of me wants to say something to my molester but it had been so long and it’s been so normalized because I have been around her so many times and she’s a different person the she was when we where younger now that’s she married with kids right

Idk