Sunstone (comics)

Sunstone is an adult webcomic series written and illustrated by Stjepan Šejić which was first published on DeviantArt in 2011. Šejić is assisted by his wife and fellow artist Linda Lukšić Šejić. The comic, described as an erotic romantic comedy, focuses on the relationship between a group of friends and their mutual interest in BDSM culture. "Sunstone" has been collected by Image Comics and Top Cow Productions into trade paperback volumes.
This series was originally planned to be a four-part story, focusing on a different couple each arc. After the first arc each new arc will feature a new subtitle. with the second arc called Mercy and the third arc called Jasper. The fourth and final arc is as yet unnamed. The main title and subtitles of the second and third references the safeword that the dom of each main couple (Ally, Alan, Marion) gives their subs to use when domming them. 
Plot summary.
The primary focus of "Sunstone" is on the main characters of Lisa Williams and Ally Carter. Lisa is a budding writer who has kept her submissive desires secret for years, and Ally is a dominant and successful businesswoman, who is somewhat of a loner.
Neither Ally nor Lisa have any same-sex experience prior to meeting each other, other than a drunken kiss Lisa shared with another girl, of which she no longer carries any memory. By the time they have finished college, and are in their mid-twenties, both have had limited experiences in the world of BDSM. Ally has had some decent S/M experience with a former boyfriend, Alan, and has become an expert in bondage, especially Shibari. But Ally has never had a relationship in a D/S relationship as a Domme with a true submissive, as Ally and Alan both prefer to dominate. Lisa, on the other hand, almost married her previous boyfriend, but left largely because she felt unable to voice her BDSM desires; she has practically no experience in S/M other than experimenting with self-bondage.
The strip opens as the pair's initial online chat leads to their meeting in real life. Complications ensue as their friendship and play-based relationship quickly develops into more than just friendship with benefits, though neither will acknowledge it. They soon find themselves (secretly) falling in love. Ally and Lisa start to face these complications when they move in together. They continue to have a Mistress-Sub relationship, are best friends and roommates, and their romantic feelings toward each other continue to grow and remain unspoken; this lack of communication leads to insecurity and conflict. Lisa becomes close with a new friend, Anne, who gets caught in the middle as Lisa and Ally's relationship spirals to a breaking point. To save their relationship, both have to face their pasts and reckon with their own self-destructive emotional patterns.
Publishing.
Since 2014, "Sunstone" has been published as a graphic novel, by Top Cow Productions and Image Comics.
Volume 1 was released on December 24, 2014, and came No. 7 in the Goodreads Choice Awards 2015 for Best Graphic Novel and Comic.
Volume 2 was released on May 12, 2015, and reached No. 7 on "The New York Times" Best Seller list the week it was released.
Volume 3 was released on August 26, 2015.
Volume 4 was released on February 24, 2016.
Volume 5 was released on January 18, 2017.
Volumes 1–5 were also prominently featured in the Humble Comics Bundle: Sex & Science (presented by their publisher, Top Cow) on November 14, 2017.
Volume 6 was released on March 26, 2019.
Reception.
The 5-issue series holds a critics' rating of 9.3 out of 10 at the review-aggregation website Comic Book Roundup, based on 19 reviews. Publishers Weekly, in a review for Vol. 1, praised its humor and humanity in its characters, but criticized the fact that it sometimes gets repetitive. Vol. 4 reached seventh place on The New York Times Best Seller list.