While I don't have an artist who focuses on it specifically in mind, I do remember a distinct chapter from Ikuhana Niiro's book Intimate Days, the original chapter is available in our subscription:
Intertwined
The chapter stood out to me because it felt like looking into a window of a real situation of that awkwardness of meeting online friends for the first time and discussing insecurities with each other. He was afraid she'd judge him for his phimosis. Ikuhana Niiro's art is impeccable, and while the scene was top notch, I'm not sure if it focuses on the fetish enough in the grand scheme. I hope you enjoy it regardless! One of my favorite artists.