Girlfriend has a “Pantsing” Fetish

I have no idea if this is weird or not. I’ve been dating this girl for 3 months now and she’s way out of my league. The first time we hooked up, she was shocked at the size of my… you know. It’s not very big and I’ve always been embarrassed about it, but she didn’t reject me, in fact, she told me that she absolutely LOVES how tiny I am. She told me she’s always had a fetish where she humiliates her boyfriend for having a tiny penis, but specifically by pantsing them (pulling down their pants in public). Whenever we’re hooking up she always says things like “I can’t wait to pants you in front of my friends and let them in on your ‘tiny’ secrets.” The other day at the beach, she pointed out a hot lifeguard and said “wouldn’t it be so hot if you went up to her and introduced yourself, and I come up and yank your bathing suit down?”

I’ve never had this fetish, but the way she’s into it and seeing how excited she gets about it is a huge turn on. What should I do? Is this a problem?