Girlfriend's Sister's Feet

I have had an intense feet fetish for as long as I can remember. More specifically, women's feet. When I see nice women's feet anywhere, I sometimes get an erection.

Background: my girlfriend's feet are very nice. I haven't had the courage to tell her about my fetish. So she doesn't know that her feet are a huge turn on for me. My girlfriend also has a sister, Tamara, with nice, soft feet. For the past few years I've been fantasizing about her feet.

One day we are together, and and Tamara catches me staring at her feet beside me on the couch. But my girlfriend is there, so neither of us say a word.

About 4 days later I had to drop something at Tamara's house. We sat around chatting for a while and she straight up asked me if I have a feet fetish because I'm always looking at her feet. I was nervous, but I admitted it.

So we're sitting around for a while, one thing led to another and I'm giving her a feet massage. She was gradually putting her foot closer to my face. After pretending not notice I finally gave in and have her a quick kiss on the sole of her foot. Shortly afterwards I was licking her feet all over. And since then, we've done that same thing regularly for another 2 years. The last time I was there was only 2 days ago.