“I have a foot fetish”

I accidentally let it slip I have a foot fetish, and now a girl keeps putting her legs and feet on my lap, and it’s not that I don’t mind, it’s that she does it in public, and whenever she does I tense up.

She’s also had a few other girls put their legs and feet in my lap but she hasn’t told anyone why that I know of. I’m scared someone will connect the dots and find out, what should I do about it?