The art is well drawn, the anatomy and positioning feel natural and fluid, and there are plenty of sexy scenes. But the absolute best part of this manga is the relationship between the two main characters. The story and the emotional development are not compromised and it is all about consent. He consistently asks her about her comfort and her willingness, and she isn't afraid to communicate and tell him when and if she is uncomfortable and why. Conflict originates from outside the relationship, rather than within (which I really appreciate). It's very accepting and healthy on both sides and is an absolute delight to read. (written as of volume 13)