May Have Caused My Girlfriend To Develop A Foot Fetish

I should start off mentioning that I have a foot fetish myself, so there's a reason behind this. I absolutely love being on the submissive end of some femdom foot fetish roleplay, so when I confessed this to my girlfriend she was more than happy to engage. We had done this quite a few times, a few months go by, and eventually she starts to get a bit curious, when we're in the bath together in a hotel, I'm playfully sucking her toes, to my surprise she starts sucking mine. When we both get dry she admits she's been curious about being on the opposite end. Now I've never thought of it, but when she mentioned it, something snapped in me that made me obsessed with the idea. We tried it out. I tied her hands behind her back, leashed her up, sat on the bed and stuck my feet in her face whilst she got to work, and let me tell you, I've never cum so hard in my life. She admitted she enjoyed every second, and ever since then, I've been letting her worship my feet whenever she wants, sometimes I don't even have to ask she just does it when she sees I'm horny. We do have normal sex, however she often has to include my toes in her mouth, it's almost like I've unintentionally trained her to be addicted to it, almost like I've unlocked something in her. I've heard it's rare to be female and have a foot fetish like this, or I guess it's just not mentioned a whole lot because women seem ashamed of it? I dunno, but I must say I feel I've hit the jackpot here.