My foot fetish and my girlfriend's younger sister. Is this weird?

Question

So I've always had an intense foot fetish that drives me insane, I'm so weak for a girl with nice feet and cute toes. My girlfriend doesn't like feet and she won't indulge in my fetish, so she doesn't mind if I watch foot porn and stuff to satisfy my cravings. I'm 22, my girlfriend is 20 and her younger sister is 17. Her sister has the cutest toes ever and they drive me crazy whenever I see her since she's been staying with us for a while. I think she knows I like them because she's teased me by putting them in my lap and wiggling them and stuff when my girlfriend was in another room. One day when my girlfriend left for work, her sister called me into her room, gave me this foot cream and asked me to rub her feet with it. I couldn't resist. It was the sexiest foot massage ever, she started moaning as my fingers slid across her creamy soles and in between her toes. I felt kinda bad because I was so insanely hard. Next she asked me to kiss her toes and I couldn't resist, they looked so delicious. I ended up sucking her toes for a while that evening and we both loved it. My girlfriend called to say she was coming home so we went back to separate rooms. Before she got home, her sister asked me if I wanted to do it again sometime and I couldn't say no. Now it's a regular thing we carry on, she'll let me rub her feet and suck her toes several times a week while my gf's at work. I don't have any feelings for her sister and we never involve genitals, it's just a consensual thing we both love doing and it's a really sexy way to satisfy my craving for feet. My girlfriend has even said she wants my fetish to be fulfilled even if she doesn't do it herself. Is this weird at all or would you say it's common?

Zoltan7 · Accepted Answer

Sometimes cheating the other is the key for a longer relationship.
Fulfilling your fetish with her sisters toes is maybe ok. She mostly gave a permission for you to do it.
I think as long as you love your girlfriend and you just want to lick the sisters toes its alright.
Even if it turns out she will understand i think.

Logorithim · Accepted Answer

As a fetish, it sound harmless to me, but I have the feeling your girlfriend won't be happy with what you're doing with her sister.

crazynlazynhot · Accepted Answer

My online friend is in a serious relationship but jerks off looking at my nail pictures. He has nails fetish. I told him it's not right but then both of us love turning each other on. So we still do it.