You said what needed to be said; I would have done the same.
Most kids simply lack the cognitive skills to realize saying something like that is wrong. Even adults struggle with it sometimes. I would not worry about others "putting the pieces" together. My first thought was that the go-to reaction from others might be that you have a female relative who experienced this---as we all know---society still does not want to think it also happenes to males despite PSU et.al.
You did the right thing.
I ask you to judge me by the enemies I have made. --FDR
I remember redwood trees, bumper cars and wolverines
The ocean's Trident submarines
Lemons, limes and tangerines
I remember this… R.E.M. 1988Cruel SummerMy Journal