Hanging out with my gf and her gf

So my gf and I occasionally hang out with one of her gf’s. We are all fairly close and grew up together through jr high and high school. Over the last couple years my girlfriend has said innuendos about my size in our hangouts which I love. She has shown pictures of me to her gf and she has told me that they have giggled about it. We even have a text thread going with all 3 of us that my gf has sent one or two pictures of my cock in it saving she would share so we know she must of have saved it on her phone. So in the last year, there has been a couple times things got pretty hot. There was one time we were bowling and we were all grab asses as we bowled which was fun. We got back to my gf house and were drinking and talking about my gf and I fantasies. My gf has been with black men in her past which I love and told how I wanted to watch her fuck a black guy and how I enjoy being teased about my size. Talking about this was turning me on and my gf knew this and saw how hard I was and started rubbing my cock over my pants, she said look how it turns him on and how hard he is, her gf said “I can see it”, with my cock bulging in my jeans . My gf told her gf to feel it and she was very hesitant but with a bit of coaxing from my gf she actually rubbed my hard cock over my pants! My gf told her we would love to have a 3some and she would really love it to be with her . My gf told me to “whip it out” which I was hesitant about but did after a few minutes which I think was a bit to much for her gf and she left the room. But she saw it! Now we know she hasn’t had sex in years and I believe that she was more afraid and nervous than anything, but other than my gf sucking me off with her gf in the other room nothing else has happened. Now the next few times we have hung out, nothing has gone that far physically, but the teasing has gotten a bit more. My gf says a lot of things about my size and her with black guys and her gf has even said a few things in agreement about it like when my gf says “it’s so small” her gf says “it really is” and another time her gf made the comment that “we should both get black boyfriends”! It’s so very hot for me and I jerk off to the thoughts constantly and would love for it to go further. And suggestions on how to go about this? I have even put questions into chatGPT but that won’t get too sexual.