Sunstone is a lesbian BDSM web comic about a budding romantic relationship and all the difficulties involved. With lots of sex and nudity. It's also been published in physical form. I've read a little of it, though I'm not caught up yet.
You can read the comic at the artist's <<
shiniez.deviantart.com/gallery/|DeviantArt page>>, using the gallery links on the sidebar for individual chapters.