Guy and his foot fetish girlfriend

So, I've been talking to a guy for a few days, and then his girlfriend also wanted to chat. Yesterday, she invited me to meet up with them, but she only wanted to watch us have sex. I decided to go and meet them, and when I got there, she told me that not only did she want to watch, she also wanted to lick/suck my feet. I saw no problem with this, and we had a fun night.