Sunstone is an adult webcomic series written and illustrated by Stjepan Šejić which was first published on DeviantArt in 2011 and later moved to Pixiv. Eight volumes of the ongoing series have been collected and published in trade paperback format by Image Comics and Top Cow Productions since 2014. The comic, described as an erotic romantic comedy, focuses on the relationship between a group of friends and their mutual interest in BDSM culture. Source: Wikipedia (en)