One day in gym class I was talking to my friends H, S, and C. H brought up fetishes and I do not know why. Somehow we got into the topic of AB/DLs. C said that it was weird and he couldn't imagine anyone doing it. H then said she knew someone who was an AB. I completely stayed out of this conversation because I did not want to give myself away. S and C were trying to guess who it could be and they brought up a couple of our other friends. H said he goes to our school and she was "not supposed to know." Then she said to S that she would tell her later.
My dilemma is, now I want to know who H was talking about! How do I approach her and ask casually?
I am really curious if I know this person. I guess if I did end up knowing them, it would be weird for me to just ask them about it directly afterward... My next question would be how to interact with them?